Sebastian Echeverry

This plugin allows you to use SCSS files directly in wp_enqueue_style. Just add the file to the list of styles and the plugin will compile it when necessary.
The base of this plugin is strongly influenced by the <a href="https://wordpress.org/plugins/wp-scss/" rel="ugc">WP-SCSS</a> code and extracts some ideas from <a href="https://wordpress.org/plugins/sassify/" rel="ugc">Sassify</a>. The goal is to keep the plugin updated with the latest version of <a href="https://packagist.org/packages/scssphp/scssphp" rel="nofollow ugc">scssphp</a>, remove configuration options from the graphical interface, and use the scssphp capabilities to create debug files.
This plugin is not intended to be installed by a conventional user, but to be required by templates or plugins that wish to include SCSS style files and therefore the configuration is expected to be done in the code.

SCSS-Library

Add support for using SCSS style files with wp_enqueue_style.

WebMaestro.Fr

Write LESS, edit your variables and compile your stylesheet from your dashboard.
<a href="http://webmaestro.fr/less-compiler-wordpress/" rel="nofollow ugc">Read the documentation</a>
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Register and enqueue your LESS sheets the same way you would do for your CSS.
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wp_enqueue_style( ‘my-less-handle’, ‘http://example.com/css/mystyle.less’, $deps, $ver, $media ); 
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Configure the plugin with the <code>less_configuration</code> filter.
Configuration of the plugin is optional, but you should at least register your variables if you are using a CSS framework.
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Set a LESS variable value
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less_set( $variable, $value ); 
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Get a LESS variable value
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less_get( $variable ); 
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You will most likely use these functions in your theme’s <code>functions.php</code>.
The plugin uses <a href="http://lessphp.gpeasy.com/" rel="nofollow ugc">the Less.php Compiler</a>.

LESS Compiler

LESS compiler for WordPress. Allows you to write and compile LESS, and to edit style variables straight into your WordPress dashboard.

SCSS-Library vs LESS Compiler