Bombs Away is a simple, three page print-and-play game about carriers in the Pacific.
rules
Spectre Modern Operations Rules
Spectre Miniatures offers a set of free wargames rules for modern operations called Spectre. Click on the “rules” tab at the top of the page.
There’s also a line of 28mm miniatures that you can buy, if you don’t already have some. I’ve got moderns in 15mm already.
Red Army White Guards Russian Civil War Rules
Red Army White Guards is a set of free wargames rules for playing battles set in the Russian Civil War. Its played on an offset grid and is apparently designed for 15mm figures; the rules call for three figures on a 30×30 mm base.
Slammer SF Rules
Tired of Warhammer 40K? Try Slammer a set of free wargames rules by Chris and Alex Nicole. The rules set is not tied to any particular set of science fiction miniatures, and there are army lists for a wide variety of troops — even Zulus! ??? (For those hordes of primitives versus superior technology games).
Fearless Science Fiction Arena Combat Game
Fearless is a set of free wargames rules that are:
… intended as a fast-paced science-fiction tabletop game including role-playing elements, with a universe full of unknown possibilities as the setting. It allows you to guide mercenaries from various backgrounds into breath-taking fights in the Arenas of Fearless. Additionally prepared scenarios and the possibility to customize your characters offer even more fun to play the game.