Mechbrawl is a free expandable card game. In it, you face off against your opponent in a giant, customizable war robot.
board game
Catan Horror
Catan Horror is a set of mashup rules for combining the board games Arkham Horror with Settlers of Catan.
Bump In The Night RPG
The current trend toward hybrid roleplaying miniatures game has been a lot of fun. I’ve played fun games that feature pirates, African safaris, Victorian street gangs, and of course, my own horror games tend in that direction.
Bump In The Night is a free RPG that I think could easily be modified for use as a role playing oriented miniatures game. At the very least, it has some good ideas.
Hidden Empires — Ant Colony Game
Hidden Empires has got a pretty unique theme:
Hidden Empires II is a game for 2 to 6 players where each player assumes the role of an ant colony. You will guide your colony as it attempts to grow and thrive in a hostile environment while competing for resources with neighboring colonies. Your colony will employ unique survival strategies based on those of real world ant species. To win the game, you must give your species the best chance of survival by producing more reproductive ants than your opponents.
MegaMan Battle Network Board Game
The Megaman Battle Network Board Game is a free print-and-play game based on the storied MegaMan franchise.