ProcessWire is a free PHP open source CMS with a great API built to save you time and make development fun at any scale.

Agile UI is a stand-alone framework that implements all the necessary components to build fully-featured and interractive user interface for your PHP applicat…

Ext JS is a pure JavaScript application framework for building interactive cross platform web applications.

kodeWeave is a HTML/ CSS playground app.

jQuery UI is a collection of GUI widgets, animated visual effects, and themes implemented with jQuery, Cascading Style Sheets, and HTML.

Liveweave is a HTML5, CSS3 & JavaScript playground for web designers and developers.

Nettuts+ is a popular site aimed at web developers and designers offering tutorials and articles on technologies, skills, and techniques.