Squeezer!

Koala is a gui for Less, Sass, Compass and CoffeeScript. Koala can run in windows, mac, and linux.

Compile Less, Sass, Scss, Stylus, Jade, Coffeescript, Haml and Markdown with live browser refresh.Prepros is a web design & development tool that does all the heavy lifting needed to preprocess, optimize and test your sites and keeps your workflow supercharged.

CodeKit automatically compiles Less, Sass, Stylus, CoffeeScript, Jade & Haml files. It effortlessly combines, minifies and error-checks Javascript. It supports Compass. It even optimizes jpeg & png images, auto-reloads your browser and lets you use the same files across many projects. And that's just the first paragraph.

Scout-App is a cross-platform desktop app that delivers the power of Sass to the hands of web designers.

Fire.app is a menu bar only app for dead easy HTML prototyping. It supports Sass/Compass, Haml, ERB, Markdown, CoffeeScript, and more.

A web developer tool that applies JavaScript and CSS changes without having to reload the page.

Compass is a stylesheet authoring framework that makes your stylesheets and markup easier to build and maintain. With compass, you write your stylesheets in Sass instead of plain CSS.

Write your LESS markup. Crunch it into a CSS file. Link the crunched CSS file in your HTML. CRUNCH allows you to organize your LESS/CSS styles into some well-organized libraries, and then just serve a single file to the browser. It also renders your page without relying on JavaScript or command-line geekery.

The life-saver app for web developers !Easily check syntax, minify or process all your web assets (stylesheets, scripts and templates) as you edit them with your favorite text editor!

Smaller is a powerful HTML, PHP, CSS and JavaScript compressor on Mac OS X, definitely a must have for every Mac based web developers.

Minimus is a GUI frontend for Yahoo’s YUI Compressor. Instead of using inconvenient and slow websites to compress your JavaScript and CSS, you can do it right on your Mac.

Javascript Packer allows you to quickly validate and compress javascript code. Developers will find that compressing a single or multiple javascript files can take seconds with this tool, saving time for development and not file management. Javascript Packer is meant to make the minification or packing/obfuscation of Javascript files quick and easy.