There’s going to be more on tinymail.org very soon. Like a trac and probably also a wiki. For now I moved the Subversion repository from our company one to one which I’m hosting myself.
So, if you are interested in the tinymail source code, you can do something like this:
svn checkout https://svn.tinymail.org/svn/tinymail/trunk
The original location has a RewriteRule. But I don’t think that works with the standard (current) Subversion client. But references to the old locations should automatically direct you to the right location.