Miniworld Dungeons and Dragons  
   Features online generators for characters, treasure, populations, surges, and spell books.
   http://www.miniworld.com/adnd

RolePlayingMaster  
   For managing characters, or developing and running adventures, offers the program for download, screen shots, and a tutorial.
   http://enworld.cyberstreet.com/hosted/rpm/

GridSmith  
   Microsoft Windows program that creates graphical combat maps. Free demo or purchase download.
   http://www.bytemountain.com/gridsmith/gsdefault.asp

DnDownloads  
   Freeware DM and player tools, Excel downloads, and character sheets.
   http://www.angelfire.com/de3/dndownloads/homepage

Dungeon Master Assistant  
   Contains a shareware download for a program to manage campaigns and battles.
   http://www.tidalcanada.com/dma

Roleplayers Home  
   Online tools including character sheets, a character generator, map creator, and an item database.
   http://www.roleplayershome.net