CSS Scan - Instantly check or copy computed CSS from any element for only ~95$
CodeKit - CodeKit allows you to optimize the performance of your website by automatically and efficiently compiling a variety of popular languages.
Hoverify - All-in-one browser extension to improve your web dev experience.
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CodePen - A front end web development playground.
Prepros - Compile Less, Sass, Scss, Stylus, Jade, Coffeescript, Haml and Markdown with live browser refresh.