Event Horizon is a set of free wargames rules for quick play starship combat. It is played on a grid board.
science fiction
Pocket Imperium Free Card Game
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.
Grav Armor Classic Dwarfstar Board Game
Grav Armor is the classic Dwarfstar game of future armored warfare. From the site:
GRAV ARMOR is a fast-moving game of future armored warfare for 2 players. It realistically simulates the high-speed, high casualty combat between streaking gravitic vehicles, surface-effects craft, supersonic fighters, orbital dropships and power-suited infantry. The modular map sections allow scenarios to be played on radically different types of planets (earthlike, molten, frozen or airless).
Bosconian D Solo Board Game
James Catalano offers Bosconian D, a free solo boardgame based on the classic Namco video game. To find it, you have to scroll down to the bottom of the page, past his (very cool) retro video games downloads.
Pulp Science Fiction Inspiration
This Flickr album has a series of covers of British pulp science fiction magazines. There’s lots here for inspiration.