EmuNations

The Mesa project began as an open-source implementation of the OpenGL specification. 

Over the years the project has grown to implement more graphics APIs, including OpenGL ES (versions 1, 2, 3), OpenCL, OpenMAX, VDPAU, VA API, XvMC and Vulkan.

 

A variety of device drivers allows the Mesa libraries to be used in many different environments ranging from software emulation to complete hardware acceleration for modern GPUs. This is particularly useful for older computers which require older OpenGL renderers.