The Random Loot Generator produces a pdf of random objects for your characters to find in Gamma World, or other post-apocalypse games. It also would work nicely with other post-apocalypse games.
RPG Science Fiction
Under The Moons of Zoon Free RPG
Under the Moons of Zoon is a John Carter of Mars inspired free RPG.
The author writes:
Under the Moons of Zoon (also UTMOZ) is the grand child of a previous project of mine Kalevala.
Kalevala was originally born in 1991 as a one of many cheap italian role playing, live action and board games collectively known as “Giochi del duemila”. Of all these mini-games Kalevala was chosen to be published in Kaos a games’ magazine published at the time by Nexus Games.
Kalevala used a sort of universal mechanic based on 1d20 and used a free-form magic system simialr to that of early versions of Ars magica.
Later on -circa year 2000- Kalevala got translated to English and completely revamped to use only d6s for publishing under Demian Katz’s Aegis.
While rewriting kalevala I had the distinct impression that the new system had potential, and already at that time I had a compulsive need to write COMPLETE rulesets, as complete as my beloved D&D Rules Cyclopedia.
UTMOZ was born from the revamped system for Kalevala, adding psionics, weird science and much more and removing magic. The main inspiration for the background setting is John carter of Mars by Edgar Rice Burroughs.
Earth Delta RPG
Earth Delta is a sci-fi RPG trying to capture an old-style vibe. The author has some interesting design goals:
Before we launch into any actual rules, it’s probably a good idea to clearly state some design goals. The goals of Earth Delta are:
Capture the spirit of old-style Gamma World, especially the first and second editions, and of the sources which inspired it or which seemed to draw inspiration from it: Hiero’s Journey, Heinlein’s Orphans Of The Sky, Metamorphosis Alpha, Kamandi, Thundarr, Wasteland, Fallout, and anything else with mutants and mayhem.
Create a game which is balanced and playable. This isn’t a beer-and-pretzels game (though it can be) or one where you create “wacky” throwaway characters. Nor is it one where random luck determines if you’re useful. One of the Unchanged is just as powerful as a winged grizzly bear with laser eyes.
Allow for the playing of winged grizzly bears with laser eyes.
Be balanced with standard 4e rules, so there’s minimal work involved in taking creatures, or characters, from this game into D&D.
Firefly For Savage Worlds
Here’s an excellent adaptation of Savage Worlds to the FireFly universe. I’m a fan of the all-too-short-lived Josh Whedon science fiction series.
Space Rat RPG
Space Rat is an RPG written by Nathan Russell in just 24 hours. It’s inspired by the cheesy science fiction movies of the 70s. It looks like a lot of fun.