SmartClient - Isomorphic software provides SmartClient, the most advanced, complete HTML5 technology for building high-productivity web applications for all platforms and devices.
FluffyChat - Open. Nonprofit. Cute ?
Dojo Toolkit - Dojo Toolkit
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Kendo UI - Fast, light, complete: 70+ jQuery-based UI widgets in one powerful toolset
Molly (Signal fork) - Molly is an independent Signal fork for Android