CodeKit - CodeKit allows you to optimize the performance of your website by automatically and efficiently compiling a variety of popular languages.
Scout-App - Process Sass files into CSS without any knowledge of the command line.
Prepros - Compile Less, Sass, Scss, Stylus, Jade, Coffeescript, Haml and Markdown with live browser refresh.
Live.js - Live. js. one script closer to designing in the browser. Say goodbye to Alt-Tab. Live.
LESS Compiler - LESS Compiler makes formatted CSS styles from less source.
Fire.app - Fire.app is a menu bar only app for dead easy HTML prototyping.