Asmadi Games offers a print and play version of its well-received One Deck Dungeon game.
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.
Tactical Game X is a modern take on the classic Panzer Leader / Panzer Blitz games, which now are pushing fifty years old. They’re still great, though, and if you love them, you might want to take a look at Tactical Game X.
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.