Lion’s Lair is a free print-and-play board game from Lou Coatney. He describes it as:
A fast-playing, point-to-point game of the British trying to battle their way through U-boats, Italian subs, Italian aircraft, German StuKas, Italian MAS motor torpedo boats, and the Italian fleet.
The Internet Archives has collection of old Ares Science Fiction and Fantasy gaming magazines. Issue #5 has a complete game called Citadel of Blood.
Outpost Gamma was one of Dwarfstar Games’ old micro games. It simulates man-to-man combat in a science fiction setting.
Anaxis is a free space wargame, played on a hex grid with ship counters.
Napoleon at Chattanooga is a free print-and-play board game. The authors write:
Napoleon at Chattanooga (NaC) is a painstakingly-researched, meticulously accurate simulation of Napoleon’s campaign in the Tennessee Valley. It is also a two-player game of exploration and conquest in the Solar System, which is also painstaking but not necessarily accurate.