The most popular ones are CVS and subversion. There are some others as well, like Mercurial and git, but I don't remember offhand if they're as totally unencumbered as CVS and Subversion. Also they may not be as well supported in IDEs such as Eclipse.
An IDE is no substitute for an Intelligent Developer.
Joined: Oct 21, 2007
Thanks TIm for a reply. Are you aware about any version control tool which available for free.
-Lave [ April 01, 2008: Message edited by: Lave Kulshreshtha ]
The soul is dyed the color of its thoughts. Think only on those things that are in line with your principles and can bear the light of day. The content of your character is your choice. Day by day, what you do is who you become. Your integrity is your destiny - it is the light that guides your way. - Heraclitus