diff --git a/.gitignore b/.gitignore
index 208178d22d..ac144ce26c 100644
--- a/.gitignore
+++ b/.gitignore
@@ -13,9 +13,6 @@
 # Exclude node.js dependencies folder
 /node_modules
 
-# Exclude compiled LESS folder
-/www/skins/build
-
 # Exclude compiled javascript test fixture folder
 /www/scripts/tests/fixtures
 
diff --git a/Makefile b/Makefile
index d324352438..840ea663f0 100644
--- a/Makefile
+++ b/Makefile
@@ -4,9 +4,7 @@ install:
 	php bin/console system:clear-cache
 	npm install
 	composer install -o
-	./node_modules/.bin/grunt install-assets
 	php bin/console system:clear-cache
-	php bin/developer assets:compile-less
 
 config:
 	@php bin/console compile:configuration
diff --git a/bin/developer b/bin/developer
index 86fae9fce6..0f71e8e3d7 100755
--- a/bin/developer
+++ b/bin/developer
@@ -13,9 +13,7 @@ use Alchemy\Phrasea\CLI;
 use Alchemy\Phrasea\Core\Version;
 use Alchemy\Phrasea\Command\Developer\APIRoutesDumper;
 use Alchemy\Phrasea\Command\Developer\Behat;
-use Alchemy\Phrasea\Command\Developer\BowerInstall;
 use Alchemy\Phrasea\Command\Developer\ComposerInstall;
-use Alchemy\Phrasea\Command\Developer\LessCompiler;
 use Alchemy\Phrasea\Command\Developer\IniReset;
 use Alchemy\Phrasea\Command\Developer\InstallAll;
 use Alchemy\Phrasea\Command\Developer\JsFixtures;
@@ -71,13 +69,11 @@ $cli = new CLI("
 $cli->command(new TranslationDumper());
 
 $cli->command(new InstallAll());
-$cli->command(new BowerInstall());
 $cli->command(new ComposerInstall());
 $cli->command(new RegenerateSqliteDb());
 $cli->command(new APIRoutesDumper());
 $cli->command(new RoutesDumper());
 $cli->command(new Behat());
-$cli->command(new LessCompiler());
 $cli->command(new Uninstaller());
 $cli->command(new JsFixtures());
 $cli->command(new IniReset());
diff --git a/config/configuration.sample.yml b/config/configuration.sample.yml
index 2dacef0004..098101f1a3 100644
--- a/config/configuration.sample.yml
+++ b/config/configuration.sample.yml
@@ -53,7 +53,6 @@ main:
         ffprobe_binary: null
         mp4box_binary: null
         pdftotext_binary: null
-        recess_binary: null
         ffmpeg_timeout: 3600
         ffprobe_timeout: 60
         gs_timeout: 60
diff --git a/lib/Alchemy/Phrasea/CLI.php b/lib/Alchemy/Phrasea/CLI.php
index 52803b6463..10e869ec3b 100644
--- a/lib/Alchemy/Phrasea/CLI.php
+++ b/lib/Alchemy/Phrasea/CLI.php
@@ -20,7 +20,6 @@ use Symfony\Component\Console;
 use Alchemy\Phrasea\Core\CLIProvider\CLIDriversServiceProvider;
 use Alchemy\Phrasea\Core\CLIProvider\ComposerSetupServiceProvider;
 use Alchemy\Phrasea\Core\CLIProvider\DoctrineMigrationServiceProvider;
-use Alchemy\Phrasea\Core\CLIProvider\LessBuilderServiceProvider;
 use Alchemy\Phrasea\Core\CLIProvider\PluginServiceProvider;
 use Alchemy\Phrasea\Core\CLIProvider\SignalHandlerServiceProvider;
 use Alchemy\Phrasea\Core\CLIProvider\TaskManagerServiceProvider;
@@ -68,7 +67,6 @@ class CLI extends Application
         $this->register(new PluginServiceProvider());
         $this->register(new ComposerSetupServiceProvider());
         $this->register(new CLIDriversServiceProvider());
-        $this->register(new LessBuilderServiceProvider());
         $this->register(new SignalHandlerServiceProvider());
         $this->register(new TaskManagerServiceProvider());
         $this->register(new TranslationExtractorServiceProvider());
diff --git a/lib/Alchemy/Phrasea/Command/Developer/BowerInstall.php b/lib/Alchemy/Phrasea/Command/Developer/BowerInstall.php
deleted file mode 100644
index c679ad0dec..0000000000
--- a/lib/Alchemy/Phrasea/Command/Developer/BowerInstall.php
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-
-/*
- * This file is part of Phraseanet
- *
- * (c) 2005-2015 Alchemy
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Alchemy\Phrasea\Command\Developer;
-
-use Alchemy\Phrasea\Command\Command;
-use Alchemy\BinaryDriver\Exception\ExecutionFailureException;
-use Alchemy\Phrasea\Exception\RuntimeException;
-use Symfony\Component\Console\Input\InputInterface;
-use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Console\Input\InputOption;
-use vierbergenlars\SemVer\version;
-
-class BowerInstall extends Command
-{
-    public function __construct()
-    {
-        parent::__construct('dependencies:bower');
-
-        $this
-            ->setDescription('Installs bower dependencies')
-            ->addOption('no-dev', 'd', InputOption::VALUE_NONE, 'Do not install dev dependencies')
-            ->addOption('clear-cache', null, InputOption::VALUE_NONE, 'If defined forces to clear the cache before installation');
-    }
-
-    protected function doExecute(InputInterface $input, OutputInterface $output)
-    {
-        $grunt = $this->container['driver.grunt'];
-        $grunt->getProcessBuilderFactory()->setTimeout(600);
-
-        $bower = $this->container['driver.bower'];
-
-        $output->writeln("Using <info>".$grunt->getProcessBuilderFactory()->getBinary()."</info> for driver");
-        $output->writeln("Using <info>".$bower->getProcessBuilderFactory()->getBinary()."</info> for driver");
-
-        $version = trim($bower->command('-v'));
-
-        if (version::lt($version, '1.0.0-alpha.1')) {
-            throw new RuntimeException(sprintf(
-                'Bower version 1.0.0-alpha.1 is required (version %s provided), please install bower-canary : `npm install -g bower-canary or run npm install from root directory`', $version
-            ));
-        }
-
-        $version = trim($grunt->command('--version'));
-
-        if (!version_compare('0.4.0', substr($version, -5), '<=')) {
-            throw new RuntimeException(sprintf(
-                'Grunt version >= 0.4.0 is required (version %s provided), please install grunt `http://gruntjs.com/getting-started`', $version
-            ));
-        }
-
-        if ($input->getOption('clear-cache')) {
-            $output->write("Cleaning bower cache... ");
-            $bower->command(['cache', 'clean']);
-            $output->writeln("<comment>OK</comment>");
-        }
-
-        try {
-            $output->write("Installing assets...");
-            $grunt->command('install-assets');
-            $output->write(" <comment>OK</comment>");
-            $output->writeln("");
-            $this->container['console']->get('assets:compile-less')->execute($input, $output);
-        } catch (ExecutionFailureException $e) {
-            throw new RuntimeException('Unable to install bower dependencies', $e->getCode(), $e);
-        }
-
-        return 0;
-    }
-}
diff --git a/lib/Alchemy/Phrasea/Command/Developer/InstallAll.php b/lib/Alchemy/Phrasea/Command/Developer/InstallAll.php
index 8fc6c3c5b1..b3dc333d5a 100644
--- a/lib/Alchemy/Phrasea/Command/Developer/InstallAll.php
+++ b/lib/Alchemy/Phrasea/Command/Developer/InstallAll.php
@@ -34,7 +34,6 @@ class InstallAll extends Command
         $ret = 0;
 
         $ret += $this->container['console']->get('dependencies:composer')->execute($input, $output);
-        $ret += $this->container['console']->get('dependencies:bower')->execute($input, $output);
 
         return min($ret, 255);
     }
diff --git a/lib/Alchemy/Phrasea/Command/Developer/LessCompiler.php b/lib/Alchemy/Phrasea/Command/Developer/LessCompiler.php
deleted file mode 100644
index 07391cb9c7..0000000000
--- a/lib/Alchemy/Phrasea/Command/Developer/LessCompiler.php
+++ /dev/null
@@ -1,45 +0,0 @@
-<?php
-
-/*
- * This file is part of Phraseanet
- *
- * (c) 2005-2015 Alchemy
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Alchemy\Phrasea\Command\Developer;
-
-use Alchemy\Phrasea\Command\Command;
-use Symfony\Component\Console\Input\InputInterface;
-use Symfony\Component\Console\Output\OutputInterface;
-
-/**
- * This command builds less file
- */
-class LessCompiler extends Command
-{
-    public function __construct()
-    {
-        parent::__construct('assets:compile-less');
-
-        $this->setDescription('Compiles Phraseanet LESS files');
-    }
-
-    /**
-     * {@inheritdoc}
-     */
-    protected function doExecute(InputInterface $input, OutputInterface $output)
-    {
-        foreach ($this->container['phraseanet.less-assets'] as $source => $target) {
-            $this->container['filesystem']->mkdir(dirname($target));
-            $this->container['filesystem']->copy($source, $target);
-        }
-
-        $output->writeln('Building LESS assets');
-        $this->container['phraseanet.less-builder']->build($this->container['phraseanet.less-mapping'], $output);
-
-        return 0;
-    }
-}
diff --git a/lib/Alchemy/Phrasea/Command/Developer/Utils/BowerDriver.php b/lib/Alchemy/Phrasea/Command/Developer/Utils/BowerDriver.php
deleted file mode 100644
index 48628daee3..0000000000
--- a/lib/Alchemy/Phrasea/Command/Developer/Utils/BowerDriver.php
+++ /dev/null
@@ -1,45 +0,0 @@
-<?php
-
-/*
- * This file is part of Phraseanet
- *
- * (c) 2005-2015 Alchemy
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Alchemy\Phrasea\Command\Developer\Utils;
-
-use Alchemy\BinaryDriver\AbstractBinary;
-use Alchemy\BinaryDriver\Configuration;
-use Alchemy\BinaryDriver\ConfigurationInterface;
-use Psr\Log\LoggerInterface;
-
-class BowerDriver extends AbstractBinary
-{
-    /**
-     * {@inheritdoc}
-     */
-    public function getName()
-    {
-        return 'bower';
-    }
-
-    /**
-     * @param array|ConfigurationInterface $conf
-     * @param LoggerInterface              $logger
-     *
-     * @return BowerDriver
-     */
-    public static function create($conf = [], LoggerInterface $logger = null)
-    {
-        if (!$conf instanceof ConfigurationInterface) {
-            $conf = new Configuration($conf);
-        }
-
-        $binaries = $conf->get('bower.binaries', ['bower']);
-
-        return static::load($binaries, $logger, $conf);
-    }
-}
diff --git a/lib/Alchemy/Phrasea/Command/Developer/Utils/GruntDriver.php b/lib/Alchemy/Phrasea/Command/Developer/Utils/GruntDriver.php
deleted file mode 100644
index 51956c1cf1..0000000000
--- a/lib/Alchemy/Phrasea/Command/Developer/Utils/GruntDriver.php
+++ /dev/null
@@ -1,48 +0,0 @@
-<?php
-
-/*
- * This file is part of Phraseanet
- *
- * (c) 2005-2014 Alchemy
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Alchemy\Phrasea\Command\Developer\Utils;
-
-use Alchemy\BinaryDriver\AbstractBinary;
-use Alchemy\BinaryDriver\Configuration;
-use Alchemy\BinaryDriver\ConfigurationInterface;
-use Psr\Log\LoggerInterface;
-
-class GruntDriver extends AbstractBinary
-{
-    /**
-     * {@inheritdoc}
-     */
-    public function getName()
-    {
-        return 'grunt';
-    }
-
-    /**
-     * @param array|ConfigurationInterface $conf
-     * @param LoggerInterface              $logger
-     *
-     * @return GruntDriver
-     */
-    public static function create($conf = [], LoggerInterface $logger = null)
-    {
-        if (!$conf instanceof ConfigurationInterface) {
-            $conf = new Configuration($conf);
-        }
-
-        $binaries = $conf->get('grunt.binaries', ['grunt']);
-
-        $driver = static::load($binaries, $logger, $conf);
-        $driver->getProcessBuilderFactory()->getBuilder()->setWorkingDirectory(__DIR__.'/../../../../../..');
-
-        return $driver;
-    }
-}
diff --git a/lib/Alchemy/Phrasea/Command/Developer/Utils/RecessDriver.php b/lib/Alchemy/Phrasea/Command/Developer/Utils/RecessDriver.php
deleted file mode 100644
index f4e5db4abd..0000000000
--- a/lib/Alchemy/Phrasea/Command/Developer/Utils/RecessDriver.php
+++ /dev/null
@@ -1,45 +0,0 @@
-<?php
-
-/*
- * This file is part of Phraseanet
- *
- * (c) 2005-2015 Alchemy
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Alchemy\Phrasea\Command\Developer\Utils;
-
-use Alchemy\BinaryDriver\AbstractBinary;
-use Psr\Log\LoggerInterface;
-use Alchemy\BinaryDriver\Configuration;
-use Alchemy\BinaryDriver\ConfigurationInterface;
-
-class RecessDriver extends AbstractBinary
-{
-    /**
-     * {@inheritdoc}
-     */
-    public function getName()
-    {
-        return 'recess';
-    }
-
-    /**
-     * @param array|ConfigurationInterface $conf
-     * @param LoggerInterface              $logger
-     *
-     * @return RecessDriver
-     */
-    public static function create($conf = [], LoggerInterface $logger = null)
-    {
-        if (!$conf instanceof ConfigurationInterface) {
-            $conf = new Configuration($conf);
-        }
-
-        $binaries = $conf->get('recess.binaries', ['recess']);
-
-        return static::load($binaries, $logger, $conf);
-    }
-}
diff --git a/lib/Alchemy/Phrasea/Command/Developer/Utils/UglifyJsDriver.php b/lib/Alchemy/Phrasea/Command/Developer/Utils/UglifyJsDriver.php
deleted file mode 100644
index cf6a0f5b88..0000000000
--- a/lib/Alchemy/Phrasea/Command/Developer/Utils/UglifyJsDriver.php
+++ /dev/null
@@ -1,45 +0,0 @@
-<?php
-
-/*
- * This file is part of Phraseanet
- *
- * (c) 2005-2015 Alchemy
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Alchemy\Phrasea\Command\Developer\Utils;
-
-use Alchemy\BinaryDriver\AbstractBinary;
-use Alchemy\BinaryDriver\Configuration;
-use Alchemy\BinaryDriver\ConfigurationInterface;
-use Psr\Log\LoggerInterface;
-
-class UglifyJsDriver extends AbstractBinary
-{
-    /**
-     * {@inheritdoc}
-     */
-    public function getName()
-    {
-        return 'uglifyjs';
-    }
-
-    /**
-     * @param array|ConfigurationInterface $conf
-     * @param LoggerInterface              $logger
-     *
-     * @return UglifyJsDriver
-     */
-    public static function create($conf = [], LoggerInterface $logger = null)
-    {
-        if (!$conf instanceof ConfigurationInterface) {
-            $conf = new Configuration($conf);
-        }
-
-        $binaries = $conf->get('uglifyjs.binaries', ['uglifyjs']);
-
-        return static::load($binaries, $logger, $conf);
-    }
-}
diff --git a/lib/Alchemy/Phrasea/Command/Plugin/AbstractPluginCommand.php b/lib/Alchemy/Phrasea/Command/Plugin/AbstractPluginCommand.php
index c12bc83ca6..915054c24b 100644
--- a/lib/Alchemy/Phrasea/Command/Plugin/AbstractPluginCommand.php
+++ b/lib/Alchemy/Phrasea/Command/Plugin/AbstractPluginCommand.php
@@ -50,9 +50,5 @@ abstract class AbstractPluginCommand extends Command
         $output->write("Updating config files...");
         $this->container['plugins.autoloader-generator']->write($manifests);
         $output->writeln(" <comment>OK</comment>");
-
-        $output->write('Building LESS assets ...');
-        $this->container['phraseanet.less-builder']->build($this->container['phraseanet.less-mapping.customizable']);
-        $output->writeln(" <comment>OK</comment>");
     }
 }
diff --git a/lib/Alchemy/Phrasea/Command/Setup/Install.php b/lib/Alchemy/Phrasea/Command/Setup/Install.php
index 51557641ef..6b2ecabad9 100644
--- a/lib/Alchemy/Phrasea/Command/Setup/Install.php
+++ b/lib/Alchemy/Phrasea/Command/Setup/Install.php
@@ -311,7 +311,6 @@ class Install extends Command
             'mp4box_binary'        => $this->executableFinder->find('MP4Box'),
             'pdftotext_binary'     => $this->executableFinder->find('pdftotext'),
             'ghostscript_binary'   => $this->executableFinder->find('gs'),
-            'recess_binary'        => $this->executableFinder->find('recess'),
         ];
     }
 }
diff --git a/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php b/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php
index f783e52787..39c91128b6 100644
--- a/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php
+++ b/lib/Alchemy/Phrasea/Controller/Api/V1Controller.php
@@ -323,7 +323,6 @@ class V1Controller extends Controller
                     'ffprobe'     => isset($binaries['ffprobe_binary']) ? $binaries['ffprobe_binary'] : null,
                     'mp4box'      => isset($binaries['mp4box_binary']) ? $binaries['mp4box_binary'] : null,
                     'pdftotext'   => isset($binaries['pdftotext_binary']) ? $binaries['pdftotext_binary'] : null,
-                    'recess'      => isset($binaries['recess_binary']) ? $binaries['recess_binary'] : null,
                     'pdfmaxpages' => $conf->get(['registry', 'executables', 'pdf-max-pages']),
                 ],
                 'mainConfiguration' => [
diff --git a/lib/Alchemy/Phrasea/Controller/SetupController.php b/lib/Alchemy/Phrasea/Controller/SetupController.php
index c45c07ede5..af89540ef9 100644
--- a/lib/Alchemy/Phrasea/Controller/SetupController.php
+++ b/lib/Alchemy/Phrasea/Controller/SetupController.php
@@ -169,7 +169,6 @@ class SetupController extends Controller
                 'ffmpeg_binary'      => $request->request->get('binary_ffmpeg'),
                 'mp4box_binary'      => $request->request->get('binary_MP4Box'),
                 'pdftotext_binary'   => $request->request->get('binary_xpdf'),
-                'recess_binary'      => $request->request->get('binary_recess'),
                      ] as $key => $path) {
                 $binaryData[$key] = $path;
             }
diff --git a/lib/Alchemy/Phrasea/Core/CLIProvider/CLIDriversServiceProvider.php b/lib/Alchemy/Phrasea/Core/CLIProvider/CLIDriversServiceProvider.php
index 9f9c4a331c..148d0db870 100644
--- a/lib/Alchemy/Phrasea/Core/CLIProvider/CLIDriversServiceProvider.php
+++ b/lib/Alchemy/Phrasea/Core/CLIProvider/CLIDriversServiceProvider.php
@@ -11,11 +11,7 @@
 
 namespace Alchemy\Phrasea\Core\CLIProvider;
 
-use Alchemy\Phrasea\Command\Developer\Utils\BowerDriver;
 use Alchemy\Phrasea\Command\Developer\Utils\ComposerDriver;
-use Alchemy\Phrasea\Command\Developer\Utils\GruntDriver;
-use Alchemy\Phrasea\Command\Developer\Utils\RecessDriver;
-use Alchemy\Phrasea\Command\Developer\Utils\UglifyJsDriver;
 use Alchemy\Phrasea\Exception\RuntimeException;
 use Silex\Application;
 use Silex\ServiceProviderInterface;
@@ -47,26 +43,6 @@ class CLIDriversServiceProvider implements ServiceProviderInterface
             return $app['executable-finder']->find($name, null, $extraDirs);
         });
 
-        $app['driver.bower'] = $app->share(function (Application $app) {
-            $bowerBinary = $app['driver.binary-finder']('bower', 'bower_binary');
-
-            if (null === $bowerBinary) {
-                throw new RuntimeException('Unable to find bower executable.');
-            }
-
-            return BowerDriver::create(['bower.binaries' => $bowerBinary, 'timeout' => 300], $app['monolog']);
-        });
-
-        $app['driver.recess'] = $app->share(function (Application $app) {
-            $recessBinary = $app['driver.binary-finder']('recess', 'recess_binary');
-
-            if (null === $recessBinary) {
-                throw new RuntimeException('Unable to find recess executable.');
-            }
-
-            return RecessDriver::create(['recess.binaries' => $recessBinary], $app['monolog']);
-        });
-
         $app['driver.composer'] = $app->share(function (Application $app) {
             $composerBinary = $app['driver.binary-finder']('composer', 'composer_binary');
 
@@ -76,26 +52,6 @@ class CLIDriversServiceProvider implements ServiceProviderInterface
 
             return ComposerDriver::create(['composer.binaries' => $composerBinary, 'timeout' => 300], $app['monolog']);
         });
-
-        $app['driver.uglifyjs'] = $app->share(function (Application $app) {
-            $uglifyJsBinary = $app['driver.binary-finder']('uglifyjs', 'uglifyjs_binary');
-
-            if (null === $uglifyJsBinary) {
-                throw new RuntimeException('Unable to find uglifyJs executable.');
-            }
-
-            return UglifyJsDriver::create(['uglifyjs.binaries' => $uglifyJsBinary], $app['monolog']);
-        });
-
-        $app['driver.grunt'] = $app->share(function (Application $app) {
-            $gruntBinary = $app['driver.binary-finder']('grunt', 'grunt_binary');
-
-            if (null === $gruntBinary) {
-                throw new RuntimeException('Unable to find grunt executable.');
-            }
-
-            return GruntDriver::create(['grunt.binaries' => $gruntBinary], $app['monolog']);
-        });
     }
 
     public function boot(Application $app)
diff --git a/lib/Alchemy/Phrasea/Core/CLIProvider/LessBuilderServiceProvider.php b/lib/Alchemy/Phrasea/Core/CLIProvider/LessBuilderServiceProvider.php
deleted file mode 100644
index 88696f0ccf..0000000000
--- a/lib/Alchemy/Phrasea/Core/CLIProvider/LessBuilderServiceProvider.php
+++ /dev/null
@@ -1,60 +0,0 @@
-<?php
-
-/*
- * This file is part of Phraseanet
- *
- * (c) 2005-2015 Alchemy
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Alchemy\Phrasea\Core\CLIProvider;
-
-use Silex\Application;
-use Silex\ServiceProviderInterface;
-use Alchemy\Phrasea\Utilities\Less\Builder as LessBuilder;
-use Alchemy\Phrasea\Utilities\Less\Compiler as LessCompiler;
-
-class LessBuilderServiceProvider implements ServiceProviderInterface
-{
-    public function register(Application $app)
-    {
-        $app['phraseanet.less-assets'] = $app->share(function ($app) {
-            return [
-                $app['root.path'] . '/www/assets/bootstrap/img/glyphicons-halflings-white.png' => $app['root.path'] . '/www/skins/build/bootstrap/img/glyphicons-halflings-white.png',
-                $app['root.path'] . '/www/assets/bootstrap/img/glyphicons-halflings.png' => $app['root.path'] . '/www/skins/build/bootstrap/img/glyphicons-halflings.png',
-            ];
-        });
-
-        $app['phraseanet.less-mapping.base'] = $app->share(function ($app) {
-            return [];
-        });
-
-        $app['phraseanet.less-mapping.customizable'] = $app->share(function ($app) {
-            return [
-                $app['root.path'] . '/www/skins/login/less/login.less' => $app['root.path'] . '/www/assets/build/login.css',
-                $app['root.path'] . '/www/skins/account/less/account.less' => $app['root.path'] . '/www/assets/build/account.css',
-            ];
-        });
-
-        $app['phraseanet.less-mapping'] = $app->share(function ($app) {
-            return array_merge(
-                $app['phraseanet.less-mapping.base'],
-                $app['phraseanet.less-mapping.customizable']
-            );
-        });
-
-        $app['phraseanet.less-compiler'] = $app->share(function ($app) {
-            return new LessCompiler($app['filesystem'], $app['driver.recess']);
-        });
-
-        $app['phraseanet.less-builder'] = $app->share(function ($app) {
-            return new LessBuilder($app['phraseanet.less-compiler'], $app['filesystem']);
-        });
-    }
-
-    public function boot(Application $app)
-    {
-    }
-}
diff --git a/lib/Alchemy/Phrasea/Plugin/Management/AutoloaderGenerator.php b/lib/Alchemy/Phrasea/Plugin/Management/AutoloaderGenerator.php
index a2a88743da..a79c6811b0 100644
--- a/lib/Alchemy/Phrasea/Plugin/Management/AutoloaderGenerator.php
+++ b/lib/Alchemy/Phrasea/Plugin/Management/AutoloaderGenerator.php
@@ -30,8 +30,8 @@ class AutoloaderGenerator
             ->doWrite('services.php', $this->createServices($manifests))
             ->doWrite('commands.php', $this->createCommands($manifests))
             ->doWrite('twig-paths.php', $this->createTwigPathsMap($manifests))
-            ->doWrite('login.less', $this->createLoginLess($manifests))
-            ->doWrite('account.less', $this->createAccountLess($manifests));
+            ->doWrite('login.scss', $this->createLoginStylesheet($manifests))
+            ->doWrite('account.scss', $this->createAccountStylesheet($manifests));
 
         return $this;
     }
@@ -40,16 +40,16 @@ class AutoloaderGenerator
      * @param Manifest[] $manifests
      * @return string
      */
-    private function createLoginLess($manifests)
+    private function createLoginStylesheet($manifests)
     {
         $buffer = <<<EOF
 // This file is automatically generated, please do not edit it.
 EOF;
 
         foreach ($manifests as $manifest) {
-            $filepath = $this->pluginDirectory . DIRECTORY_SEPARATOR . $manifest->getName() . DIRECTORY_SEPARATOR . 'less' . DIRECTORY_SEPARATOR . 'login.less';
+            $filepath = $this->pluginDirectory . DIRECTORY_SEPARATOR . $manifest->getName() . DIRECTORY_SEPARATOR . 'scss' . DIRECTORY_SEPARATOR . 'login.scss';
             if (is_file($filepath)) {
-                $relativePath = $manifest->getName() . DIRECTORY_SEPARATOR . 'less' . DIRECTORY_SEPARATOR . 'login.less';
+                $relativePath = $manifest->getName() . DIRECTORY_SEPARATOR . 'scss' . DIRECTORY_SEPARATOR . 'login.scss';
                 $buffer .= <<<EOF
 
     @import "$relativePath";
@@ -64,16 +64,16 @@ EOF;
      * @param Manifest[] $manifests
      * @return string
      */
-    private function createAccountLess($manifests)
+    private function createAccountStylesheet($manifests)
     {
         $buffer = <<<EOF
 // This file is automatically generated, please do not edit it.
 EOF;
 
         foreach ($manifests as $manifest) {
-            $filepath = $this->pluginDirectory . DIRECTORY_SEPARATOR . $manifest->getName() . DIRECTORY_SEPARATOR . 'less' . DIRECTORY_SEPARATOR . 'account.less';
+            $filepath = $this->pluginDirectory . DIRECTORY_SEPARATOR . $manifest->getName() . DIRECTORY_SEPARATOR . 'scss' . DIRECTORY_SEPARATOR . 'account.scss';
             if (is_file($filepath)) {
-                $relativePath = $manifest->getName() . DIRECTORY_SEPARATOR . 'less' . DIRECTORY_SEPARATOR . 'account.less';
+                $relativePath = $manifest->getName() . DIRECTORY_SEPARATOR . 'scss' . DIRECTORY_SEPARATOR . 'account.scss';
                 $buffer .= <<<EOF
 
     @import "$relativePath";
diff --git a/lib/Alchemy/Phrasea/Setup/Probe/BinariesProbe.php b/lib/Alchemy/Phrasea/Setup/Probe/BinariesProbe.php
index 9fcb07072d..4f8525d94c 100644
--- a/lib/Alchemy/Phrasea/Setup/Probe/BinariesProbe.php
+++ b/lib/Alchemy/Phrasea/Setup/Probe/BinariesProbe.php
@@ -28,7 +28,6 @@ class BinariesProbe extends BinariesRequirements implements ProbeInterface
             'pdftotext_binary'   => isset($binaries['pdftotext_binary']) ? $binaries['pdftotext_binary'] : null,
             'ffmpeg_binary'      => isset($binaries['ffmpeg_binary']) ? $binaries['ffmpeg_binary'] : null,
             'ffprobe_binary'     => isset($binaries['ffprobe_binary']) ? $binaries['ffprobe_binary'] : null,
-            'recess_binary'      => isset($binaries['recess_binary']) ? $binaries['recess_binary'] : null,
         ]));
     }
 
diff --git a/lib/Alchemy/Phrasea/Setup/Requirements/BinariesRequirements.php b/lib/Alchemy/Phrasea/Setup/Requirements/BinariesRequirements.php
index 4c1c32b8a6..a397757bee 100644
--- a/lib/Alchemy/Phrasea/Setup/Requirements/BinariesRequirements.php
+++ b/lib/Alchemy/Phrasea/Setup/Requirements/BinariesRequirements.php
@@ -215,13 +215,5 @@ class BinariesRequirements extends RequirementCollection implements RequirementI
             'FFProbe (or avprobe) is required for Video processing',
             'Please install FFProbe (or avprobe)'
         );
-
-        $recess = isset($binaries['recess_binary']) ? $binaries['recess_binary'] : $finder->find('recess');
-
-        $this->addRecommendation(
-            null !== $recess && is_executable($recess),
-            'Recess is required for compiling css or less files.',
-            'Please install Recess (https://github.com/twitter/recess)'
-        );
     }
 }
diff --git a/lib/Alchemy/Phrasea/Utilities/Less/Builder.php b/lib/Alchemy/Phrasea/Utilities/Less/Builder.php
deleted file mode 100644
index 827c5ffdff..0000000000
--- a/lib/Alchemy/Phrasea/Utilities/Less/Builder.php
+++ /dev/null
@@ -1,52 +0,0 @@
-<?php
-
-/*
- * This file is part of Phraseanet
- *
- * (c) 2005-2015 Alchemy
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Alchemy\Phrasea\Utilities\Less;
-
-use Alchemy\Phrasea\Utilities\Less\Compiler as LessCompiler;
-use Symfony\Component\Console\Output\OutputInterface;
-use Symfony\Component\Filesystem\Filesystem;
-
-class Builder
-{
-    /**
-     * @var LessCompiler
-     */
-    protected $compiler;
-    /**
-     * @var Filesystem
-     */
-    protected $filesystem;
-
-    public function __construct(LessCompiler $compiler, Filesystem $filesystem)
-    {
-        $this->compiler = $compiler;
-        $this->filesystem = $filesystem;
-    }
-
-    /**
-     * Build LESS files
-     *
-     * @param array $files
-     *
-     * @throws RuntimeException
-     */
-    public function build($files, OutputInterface $output = null)
-    {
-        foreach ($files as $lessFile => $target) {
-            $this->filesystem->mkdir(dirname($target));
-            if (null !== $output) {
-                $output->writeln("  Building <info>" . basename($target) . "</info>... <comment>OK</comment>");
-            }
-            $this->compiler->compile($target, $lessFile);
-        }
-    }
-}
diff --git a/lib/Alchemy/Phrasea/Utilities/Less/Compiler.php b/lib/Alchemy/Phrasea/Utilities/Less/Compiler.php
deleted file mode 100644
index d8a26e2376..0000000000
--- a/lib/Alchemy/Phrasea/Utilities/Less/Compiler.php
+++ /dev/null
@@ -1,68 +0,0 @@
-<?php
-
-/*
- * This file is part of Phraseanet
- *
- * (c) 2005-2015 Alchemy
- *
- * For the full copyright and license information, please view the LICENSE
- * file that was distributed with this source code.
- */
-
-namespace Alchemy\Phrasea\Utilities\Less;
-
-use Alchemy\Phrasea\Command\Developer\Utils\RecessDriver;
-use Alchemy\BinaryDriver\Exception\ExecutionFailureException;
-use Alchemy\Phrasea\Exception\RuntimeException;
-use Symfony\Component\Filesystem\Filesystem;
-
-class Compiler
-{
-    private $filesystem;
-    private $recess;
-
-    public function __construct(Filesystem $filesystem, RecessDriver $recess)
-    {
-        $this->filesystem = $filesystem;
-        $this->recess = $recess;
-    }
-
-    /**
-     * Compile LESS files
-     *
-     * @param string $target
-     * @param string $files
-     *
-     * @throws RuntimeException
-     */
-    public function compile($target, $files)
-    {
-        $this->filesystem->mkdir(dirname($target));
-
-        if (!$files instanceof \Traversable) {
-            $files = new \ArrayObject(is_array($files) ? $files : [$files]);
-        }
-
-        $files = (array) $files;
-
-        foreach ($files as $file) {
-            if (false === is_file($file)) {
-                throw new RuntimeException($file . ' does not exists.');
-            }
-        }
-
-        if (!is_writable(dirname($target))) {
-            throw new RuntimeException(dirname($target) . ' is not writable.');
-        }
-
-        $commands = $files;
-        array_unshift($commands, '--compile');
-
-        try {
-            $output = $this->recess->command($commands);
-            $this->filesystem->dumpFile($target, $output);
-        } catch (ExecutionFailureException $e) {
-            throw new RuntimeException('Could not execute recess command.', $e->getCode(), $e);
-        }
-    }
-}
diff --git a/lib/classes/setup.php b/lib/classes/setup.php
index 0564f9c8d3..641ac393d5 100644
--- a/lib/classes/setup.php
+++ b/lib/classes/setup.php
@@ -59,10 +59,6 @@ class setup
                 'name'   => 'FFmpeg',
                 'binary' => $finder->find('ffmpeg')
             ],
-            'recess' => [
-                'name'   => 'Recesss',
-                'binary' => $finder->find('recess')
-            ],
         ];
     }
 }
diff --git a/lib/conf.d/configuration.yml b/lib/conf.d/configuration.yml
index 9e48276ba4..371b7b1d02 100644
--- a/lib/conf.d/configuration.yml
+++ b/lib/conf.d/configuration.yml
@@ -53,7 +53,6 @@ main:
         ffprobe_binary: null
         mp4box_binary: null
         pdftotext_binary: null
-        recess_binary: null
         ffmpeg_timeout: 3600
         ffprobe_timeout: 60
         gs_timeout: 60
diff --git a/resources/vagrant/config/phraseanet/configuration.yml b/resources/vagrant/config/phraseanet/configuration.yml
index 3237c114e2..f897cfe0ce 100644
--- a/resources/vagrant/config/phraseanet/configuration.yml
+++ b/resources/vagrant/config/phraseanet/configuration.yml
@@ -60,7 +60,6 @@ main:
         ffprobe_binary: null
         mp4box_binary: null
         pdftotext_binary: null
-        recess_binary: null
         ffmpeg_timeout: 3600
         ffprobe_timeout: 60
         gs_timeout: 60
diff --git a/resources/vagrant/vms/phraseanet-php55-nginx/puphpet/files/exec-once/setup b/resources/vagrant/vms/phraseanet-php55-nginx/puphpet/files/exec-once/setup
index 81b2b072fe..19a93088d3 100644
--- a/resources/vagrant/vms/phraseanet-php55-nginx/puphpet/files/exec-once/setup
+++ b/resources/vagrant/vms/phraseanet-php55-nginx/puphpet/files/exec-once/setup
@@ -70,9 +70,6 @@ find . -maxdepth 1 -type f -exec rm {} \;
 sudo cp -rf * /usr/local/
 
 # npm binaries
-sudo npm install -g recess
-sudo npm install -g bower
-sudo npm install -g uglify-js
 
 #twig
 cd /tmp
diff --git a/tests/Alchemy/Tests/Phrasea/Command/Developper/BowerInstallTest.php b/tests/Alchemy/Tests/Phrasea/Command/Developper/BowerInstallTest.php
deleted file mode 100644
index a63e99589c..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Command/Developper/BowerInstallTest.php
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-
-namespace Alchemy\Tests\Phrasea\Command\Developper;
-
-use Alchemy\Phrasea\Command\Developer\BowerInstall;
-
-/**
- * @group functional
- * @group legacy
- */
-class BowerInstallTest extends \PhraseanetTestCase
-{
-    public function testRunWithoutProblems()
-    {
-        $input = $this->getMock('Symfony\Component\Console\Input\InputInterface');
-        $output = $this->getMock('Symfony\Component\Console\Output\OutputInterface');
-
-        self::$DI['cli']['filesystem'] = $this->getMockBuilder('Symfony\Component\Filesystem\Filesystem')
-            ->disableOriginalConstructor()
-            ->getMock();
-
-        self::$DI['cli']['driver.bower'] = $this->getMockBuilder('Alchemy\Phrasea\Command\Developer\Utils\BowerDriver')
-            ->disableOriginalConstructor()
-            ->getMock();
-
-        self::$DI['cli']['console'] = $this->getMockBuilder('Symfony\Component\Console\Application')
-            ->disableOriginalConstructor()
-            ->getMock();
-
-        $mockedCommand = $this->getMockBuilder('Symfony\Component\Console\Command\Command')
-            ->setMethods(['execute'])
-            ->disableOriginalConstructor()
-            ->getMock();
-
-        self::$DI['cli']['console']->expects($this->any())
-            ->method('get')
-            ->will($this->returnValue($mockedCommand));
-
-        self::$DI['cli']['driver.grunt'] = $this->getMockBuilder('Alchemy\Phrasea\Command\Developer\Utils\GruntDriver')
-            ->disableOriginalConstructor()
-            ->getMock();
-
-        $processBuilder = $this->getMock('Alchemy\BinaryDriver\ProcessBuilderFactoryInterface');
-        $processBuilder->expects($this->any())
-            ->method('getBinary');
-
-        self::$DI['cli']['driver.bower']->expects($this->at(0))
-            ->method('getProcessBuilderFactory')
-            ->will($this->returnValue($processBuilder));
-
-        self::$DI['cli']['driver.bower']->expects($this->at(1))
-            ->method('command')
-            ->with('-v')
-            ->will($this->returnValue('1.0.0-alpha.5'));
-
-        self::$DI['cli']['driver.grunt']->expects($this->at(0))
-            ->method('getProcessBuilderFactory')
-            ->will($this->returnValue($processBuilder));
-
-        self::$DI['cli']['driver.grunt']->expects($this->at(1))
-            ->method('getProcessBuilderFactory')
-            ->will($this->returnValue($processBuilder));
-
-        self::$DI['cli']['driver.grunt']->expects($this->at(2))
-            ->method('command')
-            ->with('--version')
-            ->will($this->returnValue('4.0.1'));
-
-        self::$DI['cli']['driver.grunt']->expects($this->at(3))
-            ->method('command')
-            ->with('install-assets');
-
-        $command = new BowerInstall();
-        $command->setContainer(self::$DI['cli']);
-
-        $this->assertEquals(0, $command->execute($input, $output));
-    }
-}
diff --git a/tests/Alchemy/Tests/Phrasea/Command/Developper/InstallAllTest.php b/tests/Alchemy/Tests/Phrasea/Command/Developper/InstallAllTest.php
index 040a8381d3..203a3b27bf 100644
--- a/tests/Alchemy/Tests/Phrasea/Command/Developper/InstallAllTest.php
+++ b/tests/Alchemy/Tests/Phrasea/Command/Developper/InstallAllTest.php
@@ -21,8 +21,7 @@ class InstallAllTest extends \PhraseanetTestCase
 
         $n = 0;
         foreach ([
-            'dependencies:composer',
-            'dependencies:bower'
+            'dependencies:composer'
         ] as $name) {
             $command = $this->getMockBuilder('Symfony\Component\Console\Command\Command')
                 ->setMethods(['execute'])
diff --git a/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/BowerDriverTest.php b/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/BowerDriverTest.php
deleted file mode 100644
index a570b49f47..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/BowerDriverTest.php
+++ /dev/null
@@ -1,30 +0,0 @@
-<?php
-
-namespace Alchemy\Tests\Phrasea\Command\Developper\Utils;
-
-use Alchemy\Phrasea\Command\Developer\Utils\BowerDriver;
-use Symfony\Component\Process\PhpExecutableFinder;
-
-/**
- * @group functional
- * @group legacy
- */
-class BowerDriverTest extends \PhraseanetTestCase
-{
-    public function testCreate()
-    {
-        $driver = BowerDriver::create();
-        $this->assertInstanceOf('Alchemy\Phrasea\Command\Developer\Utils\BowerDriver', $driver);
-        $this->assertEquals('bower', $driver->getName());
-    }
-
-    public function testCreateWithCustomBinary()
-    {
-        $finder = new PhpExecutableFinder();
-        $php = $finder->find();
-
-        $driver = BowerDriver::create(['bower.binaries' => $php]);
-        $this->assertInstanceOf('Alchemy\Phrasea\Command\Developer\Utils\BowerDriver', $driver);
-        $this->assertEquals($php, $driver->getProcessBuilderFactory()->getBinary());
-    }
-}
diff --git a/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/GruntDriverTest.php b/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/GruntDriverTest.php
deleted file mode 100644
index 963046a3d9..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/GruntDriverTest.php
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-
-namespace Alchemy\Tests\Phrasea\Command\Developper\Utils;
-
-use Alchemy\Phrasea\Command\Developer\Utils\GruntDriver;
-use Alchemy\Phrasea\Core\CLIProvider\CLIDriversServiceProvider;
-use Symfony\Component\Process\PhpExecutableFinder;
-
-/**
- * @group functional
- * @group legacy
- */
-class GruntDriverTest extends \PhraseanetTestCase
-{
-    public function testCreate()
-    {
-        $app = $this->getApplication();
-        $app->register(new CLIDriversServiceProvider());
-        $driver = GruntDriver::create(['grunt.binaries' => $app['driver.binary-finder']('grunt', 'grunt_binary')]);
-        $this->assertInstanceOf('Alchemy\Phrasea\Command\Developer\Utils\GruntDriver', $driver);
-        $this->assertEquals('grunt', $driver->getName());
-    }
-
-    public function testCreateWithCustomBinary()
-    {
-        $finder = new PhpExecutableFinder();
-        $php = $finder->find();
-
-        $driver = GruntDriver::create(['grunt.binaries' => $php]);
-        $this->assertInstanceOf('Alchemy\Phrasea\Command\Developer\Utils\GruntDriver', $driver);
-        $this->assertEquals($php, $driver->getProcessBuilderFactory()->getBinary());
-    }
-}
diff --git a/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/RecessDriverTest.php b/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/RecessDriverTest.php
deleted file mode 100644
index 61243f188a..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/RecessDriverTest.php
+++ /dev/null
@@ -1,26 +0,0 @@
-<?php
-
-namespace Alchemy\Tests\Phrasea\Command\Developper\Utils;
-
-use Alchemy\Phrasea\Command\Developer\Utils\RecessDriver;
-
-/**
- * @group functional
- * @group legacy
- */
-class RecessDriverTest extends \PhraseanetTestCase
-{
-    public function testGetCreate()
-    {
-        $recessDriver = RecessDriver::create();
-
-        $this->assertInstanceOf('Alchemy\BinaryDriver\BinaryInterface', $recessDriver);
-    }
-
-    public function testGetName()
-    {
-        $recessDriver = RecessDriver::create();
-
-        $this->assertEquals('recess', $recessDriver->getName());
-    }
-}
diff --git a/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/UglifyJsDriverTest.php b/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/UglifyJsDriverTest.php
deleted file mode 100644
index fedb166caf..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Command/Developper/Utils/UglifyJsDriverTest.php
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-
-namespace Alchemy\Tests\Phrasea\Command\Developper\Utils;
-
-use Alchemy\Phrasea\Command\Developer\Utils\UglifyJsDriver;
-use Alchemy\Phrasea\Core\CLIProvider\CLIDriversServiceProvider;
-use Symfony\Component\Process\PhpExecutableFinder;
-
-/**
- * @group functional
- * @group legacy
- */
-class UglifyJsDriverTest extends \PhraseanetTestCase
-{
-    public function testCreate()
-    {
-        $app = $this->getApplication();
-        $app->register(new CLIDriversServiceProvider());
-        $driver = UglifyJsDriver::create(['uglifyjs.binaries' => $app['driver.binary-finder']('uglifyjs', 'uglifyjs_binary')]);
-        $this->assertInstanceOf('Alchemy\Phrasea\Command\Developer\Utils\UglifyJsDriver', $driver);
-        $this->assertEquals('uglifyjs', $driver->getName());
-    }
-
-    public function testCreateWithCustomBinary()
-    {
-        $finder = new PhpExecutableFinder();
-        $php = $finder->find();
-
-        $driver = UglifyJsDriver::create(['uglifyjs.binaries' => $php]);
-        $this->assertInstanceOf('Alchemy\Phrasea\Command\Developer\Utils\UglifyJsDriver', $driver);
-        $this->assertEquals($php, $driver->getProcessBuilderFactory()->getBinary());
-    }
-}
diff --git a/tests/Alchemy/Tests/Phrasea/Controller/MinifierTest.php b/tests/Alchemy/Tests/Phrasea/Controller/MinifierTest.php
index 13bae44990..832ee5ddb1 100644
--- a/tests/Alchemy/Tests/Phrasea/Controller/MinifierTest.php
+++ b/tests/Alchemy/Tests/Phrasea/Controller/MinifierTest.php
@@ -5,6 +5,7 @@ namespace Alchemy\Tests\Phrasea\Controller;
 /**
  * @group functional
  * @group legacy
+ * @group minify
  */
 class MinifierTest extends \PhraseanetTestCase
 {
@@ -25,23 +26,6 @@ class MinifierTest extends \PhraseanetTestCase
         $_GET = [];
     }
 
-    /**
-     * @dataProvider provideGroupsToMinify
-     */
-    public function testGenerationOfGroups($name)
-    {
-        $_GET['g'] = $name;
-        self::$DI['client']->request('GET', '/include/minify/?g=' . $name);
-        $this->assertTrue(self::$DI['client']->getResponse()->isOk(), "Group $name is ok");
-    }
-
-    public function provideGroupsToMinify()
-    {
-        $groups = require __DIR__ . '/../../../../../lib/conf.d/minifyGroupsConfig.php';
-
-        return array_map(function ($group) {return [$group];}, array_keys($groups));
-    }
-
     /**
      * @dataProvider provideFilesToMinify
      */
@@ -54,17 +38,7 @@ class MinifierTest extends \PhraseanetTestCase
 
     public function provideFilesToMinify()
     {
-        $files = [];
-
-        $groups = require __DIR__ . '/../../../../../lib/conf.d/minifyGroupsConfig.php';
-
-        foreach ($groups as $name => $data) {
-            foreach ($data as $file) {
-                $files[] = substr($file, 2);
-            }
-        }
-
-        return array_map(function ($file) {return [$file];}, array_unique($files));
+        return [['scripts/apps/admin/require.config.js']];
     }
 
     public function testFileMinificationWithoutParamsShouldReturnA400()
diff --git a/tests/Alchemy/Tests/Phrasea/Core/CLIProvider/CLISDriversServiceProviderTest.php b/tests/Alchemy/Tests/Phrasea/Core/CLIProvider/CLISDriversServiceProviderTest.php
deleted file mode 100644
index acc7007eee..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Core/CLIProvider/CLISDriversServiceProviderTest.php
+++ /dev/null
@@ -1,56 +0,0 @@
-<?php
-
-namespace Alchemy\Tests\Phrasea\Core\CLIProvider;
-
-use Alchemy\Phrasea\CLI;
-
-/**
- * @group functional
- * @group legacy
- * @covers Alchemy\Phrasea\Core\CLIProvider\CLIDriversServiceProvider
- */
-class CLISDriversServiceProviderTest extends ServiceProviderTestCase
-{
-    public function provideServiceDescription()
-    {
-        return [
-            [
-                'Alchemy\Phrasea\Core\CLIProvider\CLIDriversServiceProvider',
-                'executable-finder',
-                'Symfony\Component\Process\ExecutableFinder'
-            ],
-            [
-                'Alchemy\Phrasea\Core\CLIProvider\CLIDriversServiceProvider',
-                'driver.bower',
-                'Alchemy\Phrasea\Command\Developer\Utils\BowerDriver'
-            ],
-            [
-                'Alchemy\Phrasea\Core\CLIProvider\CLIDriversServiceProvider',
-                'driver.composer',
-                'Alchemy\Phrasea\Command\Developer\Utils\ComposerDriver'
-            ],
-            [
-                'Alchemy\Phrasea\Core\CLIProvider\CLIDriversServiceProvider',
-                'driver.uglifyjs',
-                'Alchemy\Phrasea\Command\Developer\Utils\UglifyJsDriver'
-            ],
-            [
-                'Alchemy\Phrasea\Core\CLIProvider\CLIDriversServiceProvider',
-                'driver.recess',
-                'Alchemy\Phrasea\Command\Developer\Utils\RecessDriver'
-            ],
-        ];
-    }
-
-    public function testComposerTimeout()
-    {
-        $cli = new CLI('test');
-        $this->assertEquals(300, $cli['driver.composer']->getProcessBuilderFactory()->getTimeout());
-    }
-
-    public function testBowerTimeout()
-    {
-        $cli = new CLI('test');
-        $this->assertEquals(300, $cli['driver.bower']->getProcessBuilderFactory()->getTimeout());
-    }
-}
diff --git a/tests/Alchemy/Tests/Phrasea/Core/CLIProvider/LessBuilderServiceProviderTest.php b/tests/Alchemy/Tests/Phrasea/Core/CLIProvider/LessBuilderServiceProviderTest.php
deleted file mode 100644
index 4f82a0024d..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Core/CLIProvider/LessBuilderServiceProviderTest.php
+++ /dev/null
@@ -1,27 +0,0 @@
-<?php
-
-namespace Alchemy\Tests\Phrasea\Core\CLIProvider;
-
-/**
- * @group functional
- * @group legacy
- * @covers Alchemy\Phrasea\Core\CLIProvider\LessBuilderServiceProvider
- */
-class LessBuilderServiceProviderTest extends ServiceProviderTestCase
-{
-    public function provideServiceDescription()
-    {
-        return [
-            [
-                'Alchemy\Phrasea\Core\CLIProvider\LessBuilderServiceProvider',
-                'phraseanet.less-compiler',
-                '\Alchemy\Phrasea\Utilities\Less\Compiler'
-            ],
-            [
-                'Alchemy\Phrasea\Core\CLIProvider\LessBuilderServiceProvider',
-                'phraseanet.less-builder',
-                '\Alchemy\Phrasea\Utilities\Less\Builder'
-            ],
-        ];
-    }
-}
diff --git a/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration-setup.yml b/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration-setup.yml
index 9e48276ba4..371b7b1d02 100644
--- a/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration-setup.yml
+++ b/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration-setup.yml
@@ -53,7 +53,6 @@ main:
         ffprobe_binary: null
         mp4box_binary: null
         pdftotext_binary: null
-        recess_binary: null
         ffmpeg_timeout: 3600
         ffprobe_timeout: 60
         gs_timeout: 60
diff --git a/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration-with-hosts.yml b/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration-with-hosts.yml
index 1c472c2551..8e0b322dce 100644
--- a/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration-with-hosts.yml
+++ b/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration-with-hosts.yml
@@ -67,7 +67,6 @@ main:
         ffprobe_binary: null
         mp4box_binary: null
         pdftotext_binary: null
-        recess_binary: null
         ffmpeg_timeout: 3600
         ffprobe_timeout: 60
         gs_timeout: 60
diff --git a/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration.yml b/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration.yml
index 9e48276ba4..371b7b1d02 100644
--- a/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration.yml
+++ b/tests/Alchemy/Tests/Phrasea/Core/Configuration/Fixtures/configuration.yml
@@ -53,7 +53,6 @@ main:
         ffprobe_binary: null
         mp4box_binary: null
         pdftotext_binary: null
-        recess_binary: null
         ffmpeg_timeout: 3600
         ffprobe_timeout: 60
         gs_timeout: 60
diff --git a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/less/account.less b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/less/account.less
deleted file mode 100644
index a78f368f02..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/less/account.less
+++ /dev/null
@@ -1 +0,0 @@
-@import "my-plugin/account.less";
diff --git a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/less/login.less b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/less/login.less
deleted file mode 100644
index 702702a608..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/less/login.less
+++ /dev/null
@@ -1 +0,0 @@
-@import "my-plugin/login.less";
diff --git a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/scss/account.scss b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/scss/account.scss
new file mode 100644
index 0000000000..38d2705f83
--- /dev/null
+++ b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/scss/account.scss
@@ -0,0 +1 @@
+@import "my-plugin/account.scss";
diff --git a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/scss/login.scss b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/scss/login.scss
new file mode 100644
index 0000000000..87046df6a3
--- /dev/null
+++ b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDir/TestPlugin/scss/login.scss
@@ -0,0 +1 @@
+@import "my-plugin/login.scss";
diff --git a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/less/account.less b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/less/account.less
deleted file mode 100644
index a78f368f02..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/less/account.less
+++ /dev/null
@@ -1 +0,0 @@
-@import "my-plugin/account.less";
diff --git a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/less/login.less b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/less/login.less
deleted file mode 100644
index 702702a608..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/less/login.less
+++ /dev/null
@@ -1 +0,0 @@
-@import "my-plugin/login.less";
diff --git a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/scss/account.scss b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/scss/account.scss
new file mode 100644
index 0000000000..38d2705f83
--- /dev/null
+++ b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/scss/account.scss
@@ -0,0 +1 @@
+@import "my-plugin/account.scss";
diff --git a/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/scss/login.scss b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/scss/login.scss
new file mode 100644
index 0000000000..87046df6a3
--- /dev/null
+++ b/tests/Alchemy/Tests/Phrasea/Plugin/Fixtures/PluginDirInstalled/test-plugin/scss/login.scss
@@ -0,0 +1 @@
+@import "my-plugin/login.scss";
diff --git a/tests/Alchemy/Tests/Phrasea/Plugin/Management/AutoloaderGeneratorTest.php b/tests/Alchemy/Tests/Phrasea/Plugin/Management/AutoloaderGeneratorTest.php
index 82b31ad777..49bfc79340 100644
--- a/tests/Alchemy/Tests/Phrasea/Plugin/Management/AutoloaderGeneratorTest.php
+++ b/tests/Alchemy/Tests/Phrasea/Plugin/Management/AutoloaderGeneratorTest.php
@@ -25,8 +25,8 @@ class AutoloaderGeneratorTest extends \PhraseanetTestCase
             $pluginsDir . '/autoload.php',
             $pluginsDir . '/commands.php',
             $pluginsDir . '/twig-paths.php',
-            $pluginsDir . '/login.less',
-            $pluginsDir . '/account.less',
+            $pluginsDir . '/login.scss',
+            $pluginsDir . '/account.scss',
         ];
 
         $this->cleanup($files);
@@ -73,8 +73,8 @@ class AutoloaderGeneratorTest extends \PhraseanetTestCase
         $mapping = require $pluginsDir . '/twig-paths.php';
         $this->assertSame(['plugin-test-plugin' => realpath($pluginsDir) . '/test-plugin/views', realpath($pluginsDir) . '/test-plugin/views', realpath($pluginsDir) . '/test-plugin/twig-views'], $mapping);
 
-        $this->assertRegExp('#@import#', file_get_contents($pluginsDir . '/login.less'));
-        $this->assertRegExp('#@import#', file_get_contents($pluginsDir . '/account.less'));
+        $this->assertRegExp('#@import#', file_get_contents($pluginsDir . '/login.scss'));
+        $this->assertRegExp('#@import#', file_get_contents($pluginsDir . '/account.scss'));
 
         $this->cleanup($files);
     }
diff --git a/tests/Alchemy/Tests/Phrasea/Utilities/Less/BuilderTest.php b/tests/Alchemy/Tests/Phrasea/Utilities/Less/BuilderTest.php
deleted file mode 100644
index 0a5e8a0073..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Utilities/Less/BuilderTest.php
+++ /dev/null
@@ -1,27 +0,0 @@
-<?php
-
-namespace Alchemy\Tests\Phrasea\Utilities\Less;
-
-use Alchemy\Phrasea\Utilities\Less\Builder;
-
-/**
- * @group functional
- * @group legacy
- */
-class BuilderTest extends \PhraseanetTestCase
-{
-    public function testBuildSuccess()
-    {
-        $compiler = $this->getMockBuilder('Alchemy\Phrasea\Utilities\Less\Compiler')
-            ->disableOriginalConstructor()
-            ->getMock();
-        $compiler->expects($this->once())->method('compile');
-
-        $filesystem = $this->getMock('Symfony\Component\Filesystem\Filesystem');
-        $filesystem->expects($this->once())->method('mkdir');
-
-        $builder = new Builder($compiler, $filesystem);
-
-        $builder->build([ __FILE__ => __DIR__ . '/output.css']);
-    }
-}
diff --git a/tests/Alchemy/Tests/Phrasea/Utilities/Less/CompilerTest.php b/tests/Alchemy/Tests/Phrasea/Utilities/Less/CompilerTest.php
deleted file mode 100644
index 0171ebdafa..0000000000
--- a/tests/Alchemy/Tests/Phrasea/Utilities/Less/CompilerTest.php
+++ /dev/null
@@ -1,66 +0,0 @@
-<?php
-
-namespace Alchemy\Tests\Phrasea\Utilities\Less;
-
-use Alchemy\Phrasea\Utilities\Less\Compiler;
-use Alchemy\BinaryDriver\Exception\ExecutionFailureException;
-
-/**
- * @group functional
- * @group legacy
- */
-class CompilerTest extends \PhraseanetTestCase
-{
-    public function testCompileSuccess()
-    {
-        $recessDriver = $this->getMockBuilder('Alchemy\Phrasea\Command\Developer\Utils\RecessDriver')
-            ->disableOriginalConstructor()
-            ->getMock();
-        $recessDriver->expects($this->once())->method('command');
-
-        $filesystem = $this->getMock('Symfony\Component\Filesystem\Filesystem');
-        $filesystem->expects($this->once())->method('mkdir');
-        $filesystem->expects($this->once())->method('dumpFile');
-
-        $compiler = new Compiler($filesystem, $recessDriver);
-
-        $compiler->compile(__DIR__ . '/output.css', __FILE__);
-    }
-
-    /**
-     * @expectedException \Alchemy\Phrasea\Exception\RuntimeException
-     */
-    public function testCompileFileNotExists()
-    {
-        $recessDriver = $this->getMockBuilder('Alchemy\Phrasea\Command\Developer\Utils\RecessDriver')
-            ->disableOriginalConstructor()
-            ->getMock();
-
-        $filesystem = $this->getMock('Symfony\Component\Filesystem\Filesystem');
-        $filesystem->expects($this->once())->method('mkdir');
-
-        $compiler = new Compiler($filesystem, $recessDriver);
-
-        $compiler->compile(__DIR__ . '/output.css', 'not_existsing_file');
-    }
-
-   /**
-     * @expectedException \Alchemy\Phrasea\Exception\RuntimeException
-     */
-    public function testCompileExecutionFailure()
-    {
-        $recessDriver = $this->getMockBuilder('Alchemy\Phrasea\Command\Developer\Utils\RecessDriver')
-            ->disableOriginalConstructor()
-            ->getMock();
-
-        $recessDriver->expects($this->once())->method('command')->will(
-            $this->throwException(new ExecutionFailureException())
-        );
-
-        $filesystem = $this->getMock('Symfony\Component\Filesystem\Filesystem');
-
-        $compiler = new Compiler($filesystem, $recessDriver);
-
-        $compiler->compile(__DIR__ . '/output.css', __FILE__);
-    }
-}