css3-mediaqueries-js : make CSS3 Media Queries work in all browsers (JavaScript library)
Maqetta : Maqetta is an open source project that provides WYSIWYG visual authoring of HTML5 user interfaces. The Maqetta application itself is authored in HTML,...
Selectivizr : CSS3 pseudo-class and attribute selectors for IE 6-8
Slate : Slate is a completely customizable framework for building rich text editors.
Slate lets you build rich, intuitive editors like those in Medium, Dropbo...
EtherPad : Etherpad is an Open Source online editor providing collaborative editing in really real-time powered by Node.js
