I just came across your post. It is more than year old and you may have already found something but I just reply to your post in case anyone is interested.
I worked on hair simulation for TressFX and the source code is released in the AMD web site as linked below. http://developer.amd.com/tools-and-sdks/graphics-development/amd-radeon-sdk/
It is written in DirectX 11 and hair simulation uses Direct Compute (compute shader). It can be easily translated into other languages such as OpenCL since it doesn't use any DX11 specific functions much.
Alessandro, you mentioned you were working on application for hair modeling and styling. Do you have any screenshots or video to share?