Mesa
- Open source implementation of the OpenGL graphics API.
- http://www.mesa3d.org/
Realtech DXGL Wrapper - Emulates DirectX API calls through OpenGL commands and other platform specific commands in order to run DirectX 8 applications on other platform than Windows. - http://www.realtech-vr.com/directx/
OpenML - Open Media Library - Free, cross-platform programming environment for capturing, transporting, processing, displaying, and synchronizing digital media. Extensions to OpenGL, display control, device control and asynchronous communication between applications and hardware, and - http://www.khronos.org/openml/