Wolsung is a set of free wargames rules for steampunk skirmishes. The company also sells a variety of figures to go with the rules.
Miniatures Rules
The Games: Blood and Spectacle Gladiator Rules
The Games: Blood and Spectacle are a set of free wargames rules for gladiator games.
Bugle and Shako Quick Play Napoleonic Skirmish Rules
Bugle and Shako are a set of free wargames rules for quick playing Napoleonic askirmish games.
Privateers War Rules
Ross Macfarlane has a set of rules for privateer raiding actions during the American Revolution.
Men O’ War Napoleonic Sail Rules
Men O’ War is a set of free wargames rules for Napoleonic sail. The rules are aimed at small actions, with one or two ships per player.