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I make every effort to retain original source from one revision to the next. But over even a short period of time I've managed to 'lose' some revisions. I would also like better control of change documentation, and I'm thinking of automation as opposed to 'me remembering' to accurately document changes. It also comes in handy for those times when a simple modification may be repeated in a dozen different lines of code.
I honestly haven't looked around the web to see what, if anything is available. The better systems I've used in the past were all developed in-house. That would be my route too. Although it wouldn't hurt to take a look at some packages, just to get ideas about what could be built into a system. I know some of you still haunt corporate halls, and some of you work from home. How is your change management handled?