Tor’s game Relics pretty much defies categorization. It’s a fantasy world, with a black-powder/steampunk vibe. Some of the factions look like homicidal dolls, while other resemble the faerie of yore. You can take a look at the rules for free at the link.
Rules: Fantasy
Basic Skirmish For Dungeon Hacking
Matt Lloyd offers a set of Basic Skirmish rules with dungeon crawl adventures in mind.
100 Kingdoms Fantasy Rules
100 Kingdoms is a set of free wargames rules for large scale fantasy battles.
De Bellus Middle Earth Rules
De Bellus Middle Earth is DBA variant for playing wargames set in JRR Tolkien’s Middle Earth.
Dragon Fight Aerial Combat Rules
Dragon Fight is a set of free wargames rules for aerial dragon combat.