Occult World War II is a two player Warpspawn Card game. You need to make your own cards to play.
Romans and Gauls Skirmish Rules
Romans and Gauls is a set of simple free wargames rules.
PocketMod
Pocket Mod is an online application that lets you create an eight page booklet out of a single piece of paper. It’s intended for making pocket organizers — to do lists and the like — but I think it would be a great format for one-page rules systems.
The Napoleonic Source Book by Philip Haythornthwaite
Philip Haythornthwaite’s The Napoleonic Sourcebook is a good place to start for a basic understanding of the Napoleonic Wars. The volume is divided into six major sections: The Campaigns, Weapons and the Practice of War, The Nations Involved in the Wars, Biographies, Sources, Miscellaea and a useful glossary. There are more than 200 black and white illustrations, maps and charts. For the painter, the book has descriptions of various uniforms and lists of uniform, facing, hat and button colors.
Imperial Ambitions Board Game
Imperial Ambitions is a free print-and-play board game of spaceship combat with both a strategic and tactical element. The author writes:
The game is played in two parts, on two different maps. The Strategic Game is played only on the strategic map, and the Tactical Game, where battles are fought, is played only on the tactical battle maps. In the Strategic Game, units move from one star system to another, and construction, repairs and various economic functions are conducted. At the end of the Strategic Sequence of Play, any hexes containing opposing units on the strategic map may trigger a battle (at the discretion of either one of the players with forces in the same hex), at which point each battle is resolved on a tactical map using the Tactical Game