We use Subversion (svn) for version control of our codebase. There are two kinds of access to the repository anonymous and non-anonymous.
Anyone interested downloading the source code of the project can do it using the anonymous access of our repository:
Our developers have username and password and access the repository via https. SVN commit requests should be sent at our mailing list.
There are number of tools built on top of SolidOpt. They are located at https://svn.solidopt.org/Tools/ .