ReacTD is a tower-defense game using reacTIVision as a user interface. It’s the result of a graduation project for the UNIFIEO computer engineering course.
It was programmed using C++, SDL and OpenGL, and is open-source (you can navigate the svn using this link).
Update: there’s another video showing only the table working, here it is:
There are videos of work presentation (in portuguese) here:
(the gameplay starts at 6:24 of the third video)