Tridef 3D is a stereo injection driver that automatically converts games, movies and photos into stereoscopic 3D when connected to a compatible 3D monitor or 3D TV, including the Oculus Rift!
TriDef offers a 14 day trial for Tridef 3D, or you can purchase it for $39.99
Getting TriDef 3D to work with the Oculus Rift is fairly simple, and it's all lined out here on this forum page by TriDef themselves!
WARNING: Tridef does not support headtracking. This can, in most cases, be rectified with OpenTrack.