Pocket Imperium is a free card game of the Expand, Explore, Exploit and Exterminate genre. It’s designed for three players (not many of these) and uses just 18! cards.
Miniatures Rules
Fixed Bay’net an’ Uncovered ‘elmet
Fixed Bay’net an’ Uncovered ‘elmet is Colonial Variant for the Breaking of Nations rules
Breaking of Nations Universal Rules
Breaking of Nations is a set of free wargames rules for 25mm skirmish actions. Originally meant to be for the first World War, the can be used in a variety of settings. There is also a colonial variant.
Christopher’s Zulu Rules
Christopher’s Zulu Rules are a set of free wargames rules for large scale warfare in the 1879 Anglo Zulu war.
Fires of Space Rules
Fires of Space is a space combat game with a WWII naval flavor. From the author’s introduction:
Here is my take on battles between big ships in space. This rules set has a deliberately 20th century naval warfare flavor, but with adaptations for space and far future technology. Included are the rules, tables, designer’s notes, a series of ships from various space navies, scenarios, a probability table for 20 sided dice, counters, and a 50 by 50 hex map. With the map are marked map sections showing showing the map’s center hex and deployment areas for tactical scenarios. Ideally, the game is played with two 50 by 50 hex maps: one for operational movement and the other for tactical engagements. In a pinch, a single map can double as both the operational and tactical map. Finally, I include a copy of the Excel workbook that I used to create the ships in the game.