CodeKit - CodeKit allows you to optimize the performance of your website by automatically and efficiently compiling a variety of popular languages.
LiveReload - LiveReload 2 proudly presents… The Web Developer Wonderland. (a happy land where browsers don't need a Refresh button). CSS edits and image changes apply live. CoffeeScript, SASS, LESS and others just work.
Prepros - Compile Less, Sass, Scss, Stylus, Jade, Coffeescript, Haml and Markdown with live browser refresh.
Browsersync - Browsersync makes your tweaking and testing faster by synchronising file changes and interactions...
Scout-App - Process Sass files into CSS without any knowledge of the command line.
Live.js - Live. js. one script closer to designing in the browser. Say goodbye to Alt-Tab. Live.