In early November, the world’s second favorite CSS preprocessor, LESS, hit version 2.0. With v2.0 came plugins, which means compiling your LESS into your idea of perfect CSS is about to get a whole lot simpler. If you are using LESS in your build processes (grunt, gulp, burp, etc.) then you are going to want to learn about these plugins.
cleancss— The quintessential CSS compresser / minifier, formally part of LESS core, is now a plugin.
group-css-media-queries — It can be fun to write nested media queries in LESS, group-css-media-queries puts all of your identical media query definitions into one.