Mephisto is a free print and play game in which you are an adventurer collecting the souls of monsters in a dungeon to fulfil a deal you made with the devil.
Board Games
Tempus Imperium Print and Play
Tempus Imperium is a free print-and-play, roll-and-write style game. The twist is that instead of rolling dice to take your actions, you consult the date and time.
Monsters Menace Monopoly
From the fertile mind of Andrew Domino comes Monster Menace Monopoly:
All you need for Monsters Menace Monopoly is a copy of the World’s Most Popular Board Game (I don’t know if that’s trademarked, but it feels like it should be). Tired of spending hours going around and around the board buying and selling properties? Why not spend some time going around the board throwing houses and hotels at the other players, and stomping on Boardwalk? These are links for the Monsters Menace Monopoly (PDF format) rules, the monster information sheets (PDF format), and player tokens (PDF format) which you can print and cut out.
Mint Works Print and Play
Mint Works is an acclaimed worker placement game that’s designed to be stored in a mint tin (thus the name.) While sold commercially, you can get a print and play version for free.