Unconditional Surrender: Case Blue is a free print and play wargame for two players about campaigns in southern Russia from 1942 – 1943.
Historical
Farrapos Print and Play Wargame
Farrapos is a free print-and-play boardgame about the 1835 – 1845 revolution in Brazil.
Periplus Ancient Naval Game
Periplus is a free two player wargame that abstracts a battle between two fleets of ancient greek warships.
Corinth Print and Play
Major game publisher Days of Wonder offers its Corinth roll and write game free for the downloading. The game is about merchants in the ancient city of Corinth.
Table Air Combat: Spitfire II
Table Air Combat is a pay-what-you-want, print-and-play game of WWII air combat. All you need are the prints and some six sided dice.