Tabler is free and open-source HTML Dashboard UI Kit
Less, the dynamic stylesheet language
Beautifier for javascript
WebViewer UI built in React
Klipse is a JavaScript plugin for embedding interactive code snippets
Open Source HTML5 Web Audio Library
Linux desktop environment built with HTML5, CSS, JavaScript and Python
SIA receiver for Galaxy security control panels.
A project to define templates for XML markup, and tools to edit them.
A quick & dirty XUL / XBL prototyping editor for user interface.
jQuery based cross-domain feed subscriber and renderer into HTML
JavaScript API for complex cross-multi-site messaging and management