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The NVIDIA Cg Toolkit is the best way to take advantage of today's GPUs across multiple platforms and APIs. Now supporting OpenGL's ARB_vertex_program and ARB_fragment_program extensions, the compiler allows developers to create advanced visual effects for today's programmable GPUs from NVIDIA and other vendors.
Cg also comes with a suite of complementary tools, including plug-ins for artists (supporting Maya, 3ds max, and Softimage|XSI), runtime libraries, comprehensive documentation, and hundreds of shader examples.
The latest NVIDIA Cg Toolkit is designed to be your one-stop solution for shader development.
The 
