This Shell Extension integrates the CVS version control system into Windows Explorer. It provides status indicators, extra columns, property pages and other types of information about files that are under source control.
CvsIn is integrating with IDE in a different way than other tools. It is a DevStudio Add-in. CvsIn's development strategy is to have the maximum gain with the minimum effort and to have the working and operational tool FAST(!).
EasyCM is to provide an easy way to install and setup an integrated SCM environment including Apache, SVN, Trac, and so on.
Flooda is a free SCM/VC (Software Configuration Management / Version Control) tool. Its source code size is less than 4000 lines, only 1 percent of SVN (Subversion) 's. But some of its features such as task/activity are more powerful than ClearCase UCM.