What source control tools have you used when managing an ICT network and why did you select these?

This is a strictly operational question which asks you not to define the tools, but only name them and describe how you use them to manage an ICT Network. Rather than list every tool you use, only identify the top three, providing the name and a brief explanation of the tool and its functions. The danger here is providing too much rather than too little information.

"I use several different control tools to manage ICT networks. The one I use the most and which has become the standard in the ICT industry is CVS. While this is easy to use, it is not as feature-rich as some other solutions. Another tool I use is SVM or Subversion as is sometimes called. It helps to monitor and control the versions of software across the network. It is also incorporated into some of the development languages. Occasionally I will use GIT because, unlike CVS or SVN, it is a distributed product."