Updated: 12/29/2005
Game-RPGPaper
!!Game-RPGpaper
Links to player and DM tools, worlds, etc. [Report a dead link]

Autorealm
Make fantasy maps and put stuff in them. [Report a dead link]
http://www.gryc.ws/autorealm.htm

Dungeon Crafter 2
Helps you make RPG maps. [Report a dead link]
http://www.dungeoncrafter.com/

Dungeon Generator
Online only. Web page to generate random cave, dungeon, complete with window dressing, like smells, garbage, furniture, but not creatures. [Report a dead link]
http://www.aarg.net/~minam/dungeon.cgi

Dungeon Maker
This generates random dungeons with dungeon dressings and monsters, but gives no details about monsters. Printing is also difficult as it is a 2 step process. You must export the bitmap of the dungeon, then copy and paste the text to notepad to print it. [Report a dead link]
http://www.angelfire.com/rpg2/dnd3e/files/dungeon.zip

Fudge
A full game system. [Report a dead link]
http://www.fudgerpg.com/fudge/

GURPS
Generic Role Playing System [Report a dead link]
http://www.sjgames.com/gurps/

IG Tools
Online only tools to generate villages, dungeons, caves, worlds, and more. [Report a dead link]
http://www.irony.com/webtools.html

Tablesmith
Make tables with a frequency for each item in the table, then generate a random item from that table. [Report a dead link]
http://www.mythosa.net/Utils.html