Here’s a nice random dungeon map generator. They have a very old school look.
Fantasy
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.
Dark Dungeons Retro Clone Role Playing Game
Dark Dungeons is a clone of the old school D&D game. There’s been a real renaissance in the retro style RPGs, and its one I welcome after all those years of angst ridden vampires and new-style gaming.
Talislanta Setting Now Free
Talislanta is a fantastic fantasy world setting thats well out of the standard realms of elves, orks and dwarves. I always thought it more in keeping with the fantasies of Jack Vance, or another great setting, Tekumel.
At any rate, the various books, once available commercially now are available for download here.