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.
Version 1.0 (5380) | Mac OS 10.7+
Expires: 20 March 2012
See It In Action
Note: these videos are fairly dated. I'm working on new ones.
Less, Sass & Stylus
8:51
See how CodeKit makes it dead simple to use Less, SASS, SCSS or Stylus as a replacement for pure CSS. If you've never used one of these languages, you're missing out!
JS + CoffeeScript Basics
6:41
Find mistakes in your Javascript with JSLint or JSHint, then minify it automatically. Compile CoffeeScript easily and debug in real time. Watch this video and start coding faster.
JS + CoffeeScript Imports
9:08
Ever wish Javascript had an @import statement? It does now. Combine and order files via drag-and-drop or with a single line of code. Have a change of pants ready.
Frameworks
7:49
Use the same files across multiple projects without duplicating them. Keep one copy up to date and all your projects can pull that code. Watch frameworks in action.
Image Optimization
2:05
Who likes fat image files? Nobody. Until now, optimizing images was a bit of a hassle. Now, it takes just one click to reduce the file size of every image in your site.