Harp intelligently compiles assets as the browser needs them, so it’s insanely fast. All you have to do is Save and Refresh. You can keep your code clean and organized: reuse common elements with partials, and maintain a consistent site design with layouts. Whether you’re making a GitHub project page, or a mobile application using Apache Cordova/PhoneGap, you can easily compile your code to HTML, CSS & JavaScript and host it anywhere.

LESS is the dynamic stylesheet language, it extends CSS with dynamic behavior such as variables, mixins, operations and functions. LESS runs on both the server-side (with Node.js and Rhino) or client-side (modern browsers only).

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The Dynamic Stylesheet Language – LESS

LESS App for Mac OSX

LESS Compiler Written in PHP: Less PHP

The LESS Editor and Compiler: Crunch

Preprocessing Got Easier With Prepros

DMXzone LESS CSS Compiler

Rapid Prototyping With Preprocessing, Minification, Concatenation & Optimisation

Windows GUI for LESS: WinLess

GUI Compiler for LESS: Plessc (Linux)

Pack of Mixins and Variables to Use With LESS: Preboot

Set of Basic Mixins for the LESS CSS: LESS Elements

CSS Frameworks with LESS Support

The Spiritual Successor to LESS Framework: Frameless Grid

The Semantic Grid System

A LESS CSS Library

Powerful Front End Framework: Bootstrap

Convert 960 CSS Framework to LESS Format

Joomla Extension for Compiling LESS Files

Joomla Plugin to Automatically Compile LESS Templates Files on Page Load

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LESSHat is a universal mixin library featuring a bunch of smart LESS mixins.

• Universal
  If it’s possible in CSS, it must be possible to be done with a mixin. Unlimited number of anything, shadows, gradients, gradient swatches
• Cross-browser
  The library should export CSS for all available browsers. Old gradient syntax for iOS4? Totally!
• Configurable
  Building a webkit app? Turn off all other browsers and get just CSS3 and -webkit- extensions without the clutter

Preboot has been reborn with many of the LESS variable and mixin improvements from Bootstrap, along with some new enhancements, too. It’s one of the lightest and most powerful tools for CSS development without any prebuilt components.

This tool has been thought for front-end developers who are tired of working with CSS. With this little handy tool you can quickly convert your old CSS files to fresh new LESS files. You can also convert files locally by install the CSS2Less RubyGems.

This service run on Sinatra and has been built with HAML & LESS with the help of the excellent ACE Editor.