Annwvyn Engine is a free and open source game engine desinged to create 3D programs using the Oculus Rift virtual reality headset
Annwvyn is distributed under the terms of the MIT Licence Agrement
The engine use free and open source technologies including OGRE for 3D rendering, Bullet Physics simulation and collision detection library, the OpenAL-soft for Audio and statically include BtOgre and TinyXML. Additionally the engine use libsndfile to decode audio files into buffer that can be read by OpenAL.
More informations about this can be found on the documentation wiki
You can download precompiled SDK or the source code on the Download page.
And have fun exploring virtual worlds with us !