Cg

Cg is nVidia's portable shading language, supported by OpenGL and D3D.

Subcategories 1

Shading Languages

Sites 2

CodeSampler.com - OpenGL (1.2 - 2.0) game programming samples for Windows CodSampler's list of OpenGL sample code, including many examples of Cg shaders.
Wikipedia: Cg A brief history, description of Cg data types and sample code.