Open-source, cross-platform 3D rendering engine for .NET and Mono. The Axiom Engine is a high-performance C# port of the powerful OGRE engine and provides full support for DirectX, OpenGL and XNA on Windows, Linux, Android, iPhone and Windows Phone.
libfixgl, is an implementation of the OpenGL standard for realtime 3D graphics, based on fixed point arithmetic. It is mainly targeted towards handheld consoles such as the GP2X, GP32, GBA, or other FPU-less embedded devices.