Here’s a nice random dungeon map generator. They have a very old school look.
Role Playing Game
Stars Without Number Free RPG
Stars Without Number is temporarily free at RPG Now. It’s an old-school RPG.
The year is 3200 and mankind’s empire lies in ashes.
The Jump Gates fell six hundred years ago, severing the links between the myriad worlds of the human diaspora.
Now, the long isolation of the Silence falls away as men and women return to the skies above their scattered worlds.
Will you be among them?
Stars Without Number is a retro-inspired science fiction role playing game influenced by the Old School Renaissance. The contents are compatible with most old school clones and are designed to be easily imported to your own favorite gaming system. In addition to a complete pre-made stellar sector, Stars Without Number offers GMs and players the tools to create their own sandbox-style adventures in the far future.
Classic mechanics adapted for science-fiction adventure in the far future
Extensive GM support for building adventure-crammed sandbox settings more quickly and easily
World building resources for creating system-neutral planets and star sectors
100 adventure seeds and guidelines for integrating them with the worlds you’ve made
Old-school compatible rules for guns, cyberware, starships, and psionics
Domain rules for experienced characters who want to set up their own colony, psychic academy, mercenary band, or other institutio
Blaster Simple Science Fiction RPG
From the author:
Blaster is a generic SciFi RPG in the 26th century where mankind’s unity has been sundered by war and where a few good men can still make a difference.
More like Firefly and Buck Rogers (the 1930′s version) than Star Trek you will form a team of adventurers who have a small starship which they can use to explore, travel, trade and fight against the dying of the light.
As usual both the core rules and the setting are single page affairs and are completely compatible with other titles in the Dead Simple RPG series.
Zombie Squad RPG
Zombie Squad is billed as a “zombie horror survival” RPG. Looks like fun.
Danger Patrol RPG
Danger Patrol is a pulp-style RPG with a very interesting dice mechanic that I think would be great for skirmish style wargames. With the mechanism, players voluntarily make things more difficult for themselves in order to gain reward points when they succeed against overwhelming odds.