Hack and Sack New Jersey is a free hex style wargame about an alien invasion of New Jersey:
The alien Krylons invade the Garden State! Spaceships disgorge hordes of Cossacks and Roman-style legions; Jerseyite biker gangs and accountants fight back. 2 players.
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Good Little Martian is a print-and-play card game for two players. The cooperative game has one player stranded on Mars, and the other on a rescue mission.
Pocket Imperium is a free print-and-play game in the 4X Genre (Expand, Explore, Exploit and Exterminate). It is designed for three players to finish in 45 minutes. The game features three spacefaring races.
Paranoia: Troubleshooters is a set of free rules for a card game based on the West End Games' Paranoia RPG.
Jeremy Claridge offers "Bugged" a free board game of galactic conquest. The author writes:
Welcome to Bugged! The hex based wargame of the extraterrestrial kind.
Bugged! Will let you engage in the conflict for territory that has plagued humankind ever since it took to the stars.
In Bugged! You can play one of the four main races that inhabit the galaxy in an attempt to wipe out any opposition. You could be anything from the mutant bugs with their limited intelligence but powerful weapons to the more resourceful but heavily outnumbered human marines.
So lets get you started on the road to Galactic Conquest…………………………….
To play Bugged! You will need some figures to represent your units, a hex marked playing surface and a dozen or so six sided dice.