The Internet Archives has collection of old Ares Science Fiction and Fantasy gaming magazines. Issue #5 has a complete game called Citadel of Blood.
board game
Outpost Gamma Science Fiction Board Game
Outpost Gamma was one of Dwarfstar Games’ old micro games. It simulates man-to-man combat in a science fiction setting.
Anaxis Space Combat Game
Anaxis is a free space wargame, played on a hex grid with ship counters.
Napoleon At Chattanooga
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.
The Abstractionist
The Abstractionist is a free print-and-play board game for 2 – 6 players about artists creating color palettes for their abstract paintings. The core mechanism is tile laying.