NvCloth source code is available as well
Alongside with Blast 1.0 release, NVIDIA has revealed NvCloth – a new cloth simulation solution, that is intended to replace the APEX Clothing module.
NvCloth features fast and robust cloth simulation, offers efficient collision detection suitable for animated characters and provides low level interface with little overhead and easy integration.
Simulation can be executed on CPU, or CUDA/DX11 capable GPUs.
NvCloth 1.0 source code branch can be accessed at github.com/NVIDIAGameWorks/NvCloth.
Please Note that you’ll require an approved GitHub account, as described here.