ZK is an open source AJAX framework that assists in rapid development of rich Internet applications.

GetSimple is an easy to learn, open source CMS that uses XML for storing data.

Megazine 3 is an open source Flash object that generates an interactive book interface via external XML.

TiddlyWiki is a single html file which has all the characteristics of a wiki – including all of the content, the functionality (including editing, saving, tagging and searching) and the style sheet.

CushyCMS is a free, easy-to-use Content Management System that allows you to expose editable regions inside your html document.

Manage and preview your Photoshop brush library with ABRviewer.

Opentape is a free, open-source package that lets you make and host your own mixtapes on the web.

Roadsend compiles your PHP into stand-alone executables that do not require an interpereter.

David Hellsing has put a nice twist on this AJAX Thumbnail Gallery using Jquery and some smart preloading. Take if for a test drive and pick up the latest source from Google Code.

Snipplr is a place to find and share common code functions, css, and templates.