Trionic Labs

<p>SASS is a programmable approach to stylesheets which really adds some cool features. It can make a stylesheet easier to read, easier to update and also adds some powerful features like functions, variables and imports. (See http://sass-lang.com/docs/yardoc/file.SASS_REFERENCE.html for more details.)</p>
<p>This plugin enables any WordPress Theme to use SASS stylesheets.  In a wordpress theme, the comments at the top of style.css are used to define the theme.  For this reason, this plugin will not allow a .sass or .scss file named ‘style’.</p>


WordPress SASS

This plugin provides automated SASS stylesheet generation.

Trevor Anderson

<p>Edit CSS/Sass/Less and watch it update in realtime with the customizer.</p>
<h4>Features</h4>
<ul>
<li>Use advanced CSS preprocessors Sass or Less.</li>
<li>Autoprefixer support, write your CSS rules without vendor prefixes and let Autoprefixer add vendor prefixes for you.</li>
<li>Syntax highlighting editor with options for color themes and font sizes.</li>
<li>Sass and Less preprocessor options for compressed or uncompressed output.</li>
<li>Autoprefixer options to control browser prefix output.</li>
<li>Easily download processed output as a standalone css file.</li>
</ul>


Tuxedo CSS Editor

Realtime CSS editing in the customizer with Sass, Less and Autoprefixer support.

WordPress SASS vs Tuxedo CSS Editor