WebFX: A great set of dynamic HTML widgets. They are free for personal or GPL use, but for commercial use, there is a separate license. OpenTrack2d uses their slider widget.
spcaview: The home page SpcaView and other software related to control of the very popular SPCA based webcam chips. The OpenTrack3d software has been based on this. Special thanks to Michael Xhaard.
OpenEEG Project: The OpenEEG Project is to help people build electro-encephalograph hardware and software for low end science or personal projects. It includes schematics and links to code.