Fire Away is a simple print and play wargame that’s nominally about pacific island warfare.
Avalon Hill’s classic 1962 Waterloo boardgame has been given a facelift by John Cooper, who makes the redone map and counters available as a free download.
Cheapass Games offers Renfield, a card game about parts, tools, gravestones and “yummy delicious bugs.”
Years ago, GDW used to hand out copies of a simple Frank Chadwick game called Battle for Moscow. I’ve got a copy, and have used it to introduce players to board style hex wargaming. If you dont’ have a copy of this classic, you can download it here.
The Barons of Fyn is a free downloadable card and tile game from Bones Games. In the game, rival barons try to expand their borders, building a fiefdom of loyal towns and cities, and strengthening their armies. It’s beer and pretzels for 2 to 6 players. I’ve played this, and its fun.