Phantoms is a set of free wargames rules based on the old Avalon Hill “Mustangs” game. It’s for playing air combat games from 1960 to present. The link is to the deluxe version with all of the updates, data cards and scenarios.
Rules: 20th Century
Vietnam Air Fury Rules
Vietnam Air Fury is a set of air combat rules based on the earlier Space Fury Rules.
Square Hearts Colonial Wargames Rules
Square Hearts is a set of free wargames rules for colonial wargames in the 19th and early 20th centuries. It’s played on a square grid.
Contre Les Viets Vietnam Wargames Rules
Contre Les Viets is a Vietnam variant of Arty Contliffe’s Crossfire. You need the original rules to play.
Beyond The River Don Campaign Rules
The Perfect Captain has released a campaign system for his Red Actions! rules set. From the Captain:
We have completely outdone ourselves this time! What if I told you this was a campaign game that takes maybe 30 minutes to create from scratch, with limitless scenarios, a different map each and every time, and has counters representing the following armies and their equipment: Reds (All over Russia), Whites (Kolchak, Deniken, Wrangel, Yudenich, Komuch, Kappelites etc), Greens (Mahknovists), Estonians, Latvians, Finns, Lithuanians, Ukrainians, Poles, Armenians, Turks, French, Greeks, Japanese, American, British Empire (Including Canadians, Australians, and Indians), and Freikorps.