Argent Lake - gonzo worldbuilding wiki exercise
Masters of the Universe series bible - By the power of Grayskull!
The Table of Despair - helps motivate your players to get out of the dungeon before the session is up
National Gaming Day - Demoing at your local library, anyone?
Dan's Diminutive D20 - another tiny d20 hack
OD&D, B/X,WhiteBox Alternative Magic System
2 hours ago