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.

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.

LESS Compiler vs SCSS-Library