Hohenfriedeberg is a free board game of the print-and-play, hex-and-counter variety. It depicts the battle of Hohenfriedeberg, which took place during the Second Silesian War in 1745.
Origins of World War I is a free print-and-play game by legendary wargames designer James Dunnigan. The game was re-implemented as Origins of World War II, an Avalon Hill game now long out of print. From the description:
A political/strategy game in which five players represent the five major nations in pre-World War I Europe. They must compete against each other to achieve each nation's 'national objectives'. While actual war is not allowed in the game, the play should show quite clearly how tensions developed to such a high pitch in 1914.
Dave Ferris offers Napoleon at Chattanooga, a print and play boardgame that simply has to be described by the author himself:
Napoleon at Chattanooga: Boardgame of Napoleon's famous campaign in the Tennessee Valley, conquest of the Solar System, and an armoured regiment named Bob. Some assembly required. My most successful boardgame design. 420K zipped archive includes maps, counters (must be glued to cardstock and cut out), charts, rulebook, and errata.
Country Houses is a DIY card game in which players are 19th century landowners.
Patton's Lorraine Campaign is a free print-and-play, hex-and-counter wargame from Lou Coatney.