Black Hack?
In reply to atminn (msg # 1):
All the various offshoots of The Black Hack are lean, fast-paced, and work well enough with some only slightly imaginative tweaks to play well here on RPoL. Can't knock the price in the head, either.
It is a rule-light system, and invites customization/derivative works, as if one were being handed a retro-style old-school game building toolkit.