Horde3D
https://github.com/horde3d/Horde3D
Horde3D is a small 3D rendering and animation engine. It is written in an effort to create a graphics engine that offers the visual effects expected in next-generation games while at the same time being as lightweight and conceptually clean as possible.
Further development has moved to https://github.com/horde3d/Horde3D
where you're also able to download new releases.