Quests of Legend has a nice collection of dungeon tiles for you to print out and use for your role playing or miniatures games (or both!) in a dungeon crawl.
RPG Fantasy
Machinations Steampunk RPG
Machinations is a simple steampunk RPG. From the author’s description:
Welcome to the Eternal City, the home of the Machinations RPG. Take on the role of an Adventurer, an Alchemist, an Artificer or even a deathless Automaton. Band together with others to form a Free Company and then hire yourselves out to perform acts of sabotage, espionage, assassination, extortion, blackmail or plain old robbery. All in a world a short step from our own, where reason has been lost, empires exist to be built and strange technology dominates all walks of life. It is a world of sinister intrigue, awful power, terrible events and dark portents. There is also beer, song and glory
Random Dungeon Generator
Here’s a nice random dungeon map generator. They have a very old school look.
Swords and Wizardry RPG
Swords and Wizardry is yet another free, old school fantasy RPG
Spellcraft and Swordplay Role Playing Game
Free for the downloading, Spellcraft and Swordplay is a professionally done “old school” fantasy RPG.