Cassapa is system that uses augmented-reality to help aiming at pool games.
Only the binaries are hosted here at SourceForge. Please check the GitHub project page for the source code
Project mARbleMaze is an augmented reality minigame where the user uses a printed marker and his webcam to solve marble maze levels. Levels involve special fields like invisible walls and holes.
A plugin to do Gymkhanas in the LibreGeoSocial project (a mobile social network with a Mobile Augmented Reality interface. More Info: http://libregeosocial.morfeo-project.org/)
IrrAR is a combination of Irrlicht and Augmented Reality to create the most rapid development platform for augmented reality at the moment. IrrAR creates 3D "nodes" out of real lifer markers to let you insert your 3d world into the real world.