Processed Tower Defense
Processed Tower Defense is a Tower Defense style game built using the Processing.js JavaScript library written by John Resig. It has come a long way since its lowly orgins (May, 2008) and now has a variety of types of creeps and upgradable towers.
On May 28th, 2008, Peter Burns began developing the program as well, and was kind enough to set the project up on GitHub. Current development can been seen here, and more developers are welcome to contribute. Those interested in the structure of the implementation can read about it in this first entry concerning overall design, and a follow up entry looking at adding a variety of creeps and tower upgrades.
You can play an up-to-date version of the game at ptdef.com.
The feature and bug tracker is hosted on Lighthouse and the repository is hosted on GitHub.