From publisher blurb:
Renaissance is Cakebread & Walton’s D100 roleplaying system designed for the age of black powder weapons. It is available in two forms – the Renaissance SRD, a bare-bones rules system which is free to download, and Renaissance: Deluxe, a fully-fledged core-rulebook, available as a 170 page softback from Cubicle 7 Entertainment. Renaissance Deluxe contains everything you need to tell gritty, heroic tales of adventure – whether they be historical, alternate or pure fantasy – for the period from around 1500-1800. The rules are released under an Open Gaming License, which means that other companies can use the rules in their own games.
The rules were originally designed for our game of alternate historical fantasy, Clockwork & Chivalry (2nd Edition), but have been expanded to be usable in any “flintlock and steel” background you care to mention.