There are many
Software Configuration Management (SCM) systems also called Revision Control Systems and trillion other names :-) ....
Being a Sun employee, I've been using Teamware ever since I joined Sun. During the development of JDK 6, I became involved in integrating JSR-223 reference implementation (RI) code into JDK 6 (
In a recently started project, we have started using Subversion. I read The Subversion book. When I say I "read", I mean I read it just enough for working with a repository. I don't attempt to read to become an expert - I've not done that with Teamware either!
I hope I won't have to learn yet another SCM before 2015 :-)