I debated putting RCS on the list; after all it's the grandaddy of em all, and is still in live use by some people (or so I hear). OTOH, it was strange enough that I wanted to encourage people to write a note about it, rather then just going click-click and voting for it. Why do you like RCS better then, say, CVS (which is just a layer on top of it, after all...)?
Warning: Unless otherwise stated, code is untested. Do not use without understanding. Code is posted in the hopes it is useful, but without warranty. All copyrights are relinquished into the public domain unless otherwise stated. I am not an angel. I am capable of error, and err on a fairly regular basis. If I made a mistake, please let me know (such as by replying to this node).