A Python binding to the popular "SVM-Light" support vector machine library (http://svmlight.joachims.org/) by Thorsten Joachims.
An implementation of the "Dope Wars" game from the TI-83 calculator... in Haskell :)
My personal website
An extension for Sage that makes it easy to draw geometrical figures.
A website built on Google App Engine for sharing art works.
A Linux daemon that can synchronize files to the cloud using Amazon S3 -- intended for backup of servers.
A robot for Google Wave that imports the contents of an RSS feed for collaborative viewing and commenting.
An Android application to provide a system search provider for Wikipedia.
A content management system for a webcomics site, in PHP with a MySQL data store.