OpenSubdiv is a set of open source libraries that implement high performance subdivision surface (subdiv) evaluation on massively parallel CPU and GPU architectures. This codepath is optimized for drawing deforming surfaces with static topology at interactive framerates. The resulting limit surfaces are a match for Pixar's Renderman specification within numerical precision limits. OpenSubdiv is a code API which we hope to integrate into 3rd. party digital content creation tools. It is not an application, nor a tool that can be used directly to create digital assets.
For more info: http://graphics.pixar.com/opensubdiv/docs/release_notes.html