21d 15:22:31 until the OGMW forums will transition to fully read-only mode. Read more here.
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I'm DM'ing a battletech RPG based on the FATE system. You're welcome to use my system. From the standpoint of DM'ing it, the sarna.net wiki is invaluable, as is a basic knowledge of how the battletech board game plays out.
What type of setting are you wanting to play? I can give you a few for which ever type. I'll recommend Fate, Warrior, Rogue and Mage, or even Labyrinth Lord until I can give more accurate systems.
A "Free RPG" thread that goes this far without mentioning Risus is borderline criminal. It's a simple system that really shakes up a lot of your preconceptions about gaming in a way that The Window wishes it could do. (Sorry, I just have a beef against The Window; it's a bit pretentious and condescending to Inferior Games...and a tad hypocritical.)
All things considered, though, Risus is remarkably flexible and brilliant in its simplicity. The more you think about it, the more interesting the system gets. It's 6 pages of RPG brilliance.