You can clone with
HTTPS or Subversion.
pscnv is a fork of the nouveau kernel driver that uses a custom memory manager instead of TTM.
See TODO for more details.
First, please join us at #pathscale, on freenode(IRC).
You can also help us by testing some early code, see TestingWanted.
If you are a developer, you can also have a look at the Introductory Course and then start hacking the non-implemented parts. See TODO and decide what task you want to tackle.