SourceForge Enterprise Edition 4.4 is available for free for up to 15 users. We use it for our development team and another development team where I work.
It's been working great for us. It has subversion and cvs built in (whichever you wish to use). If you plan on accessing it over the internet you might want to enable HTTPS. I had to do a little finagling to get HTTPS to work correctly (finding the right CentOS packages to install). If you wanted to use this solution with HTTPS I wouldn't mind if you sent me a message asking for help.
It comes with a VM for VMWare Player:
http://www.collab.net/downloads/sfee/index4.4.html
