Zeppelin Derby is a free print and play game that uses just 17 cards. From the game description:
It’s race day! Aircrews to your Zeppelins! In this fast-playing racing game for two intrepid Zeppelin pilots, the players race their airships by rolling dice and playing cards — including a few dirty tricks! Who has the moxie to cross the finish line first?
Witch Hunt is a print-and-play card game with just 18 cards. It’s a “traitor” style game with a twist.
The Engine Empire is a print-and-play card game that requires only 18 cards. From the description:
In a dystopian alternate reality, four great powers vie for control of the continent. Each Empire’s soldiers lay siege to opposing cities, while their war efforts are funded by exotic exports and ingenious inventions. Only one state will orchestrate their limited resources into an Empire Engine powerful enough to lead them to victory.
It has gotten good reviews on Board Game Geek.
Gamers of a certain age will fondly remember Magic Realm, Avalon Hill’s fantasy adventure game. It is long out of print, but you can find an interesting online game facilitator here.
Multiman Publishing offers a free board game of the Battle of Epinosa (Nov. 10 – 11, 1808).