What is the main use of SCM tools?What are the different SCM tools available?
Re: SCM Tools
To support the SCM activities... These tools help to have and keep a consistent set of deliverables. Maybe checking out what Software Configuration Management means would be interesting. I doubt that a little reply here won't help you much.
Available tools: your favourite search engine will without a doubt provide you with a wealth of links.
Some I know: PVCS from Merant, ClearCase from Rational/IBM. But there are a lot of others. Currently we are using an inhouse developed tool.