CodeKit helps you build websites faster and better.

Features:

• Compile Everything: Process Less, Sass, Stylus, Jade, Haml, Slim, CoffeeScript, Javascript, and Compass files automatically each time you save. Easily set options for each language.
• Live Browser Reloads: Instantly see changes in your browser, with animation and without hitting the refresh button or installing plugins. Great for tweaking layouts!
• Combine and Minify: Reduce load times by mashing Javascript and CoffeeScript files together and then minifying with Uglify.js. It's so easy, you'll giggle like a schoolgirl. Seriously.
• Optimize Images: Losslessly reduce JPEG and PNG file sizes with one click and see the savings. One less thing to do at deployment. (More compression options coming soon!)
• JSHint and JSLint: Makes debugging scripts fun and easy. Instantly find that one hanging comma that kills IE, or enforce coding styles and best practices across teams.
• Team Collaboration: Sync project settings across teams and computers in an open JSON format. Keep everyone on the same page or easily jumpstart new sites.
• Easy Frameworks: Keep just one copy of a file on your drive and easily use it across many projects without worrying about file paths. No more copying files into every new site.
• It Just Works: There's nothing to install or configure. No mucking around the command line. Just run the app and start working. It's that easy.