Docufluff
Articles, essays, and game journals on multiple games.
Neonflux
100+ character sheets for many systems in PDF and TIFF format, plus adventures for D&D and Palladium.
RPG Hoard - downloadable resources
Some adventures, fonts, maps, monsters, programs, and other resources for some systems.
RPG Sheets
Over 700 character sheets from over 200 game systems, including official sheets, custom and WebRPG.com sheets. Accepts submissions.
RPGArchive
Archive of adventures categorized by genre and system. Accepts submissions.
The Dragons' Den
Netbooks, adventures, and character graveyards for D&D, West End's Star Wars, and the World of Darkness.
The Harrow
Former roleplaying guide Dru Pagliassotti's archive of articles on roleplaying, gamemastering, and adventure writing.
The Keep
A large collection of files, mostly related to RPGs: systems, rule supplements, information about or for campaign settings, adventures and ideas for adventures, other GM aids, fiction, humour, and miscellaneous RPG material.
The RPG Character Mortuary
Final resting place for characters who died - tragically or otherwise - in roleplaying games. Accepts submissions.