Software

Hamete.org's Virtual Dice Server - Generates online and by-e-mail dice rolls.
http://hamete.org/dserver/dices

TenFootWiki - A self-contained wiki as a personal campaign notebook for roleplaying gamemasters.
http://www.unclebear.com/tenfootwiki/

DemonSpawn Software - An online organization devoted to providing gamers with resources and programs. MapMaker, FUDGE and Tunnels and Trolls die rollers, all in Beta test (trial download), for PCs.
http://www.demonspawn.net

Eposic - Free online JavaScript and Java online roleplaying tools including animated Tunnels and Trolls dice roller, random event, weather, GM decision, NPC rune generators, private dice rooms for online RPGs, gallery of downloadable images.
http://www.eposic.com/

Codex of Universes - Online editing of worlds and campaign settings. Users can create new universes to catalog and showcase their particular setting.
http://www.codexofuniverses.com/

DA: The Role Player's Digital Assistant - A tool designed to help create, organize, and run tabletop roleplaying games. [Shareware|Windows NT/2000/XP]
http://www.mjhkstudios.com/DA/Frameset.htm

AnderWare Development - Features MasterPlan, a freeware scenario-planning utility for Windows.
http://www.anderware.org/dev/

Dungeon Helper - Mapping and dice software to make it easier to play Pen and Paper over the Internet. [Windows]
http://dh.abomb.info

The Adventurer's Diary - A shareware Windows database application for keeping track of events and persons the player meets.
http://adventurer.worldofbelushi.de/

Garthac Games - Creates products that support and enhance role playing games. MageHand is a tool for creating, modifying, organizing, sharing and printing campaign information.
http://www.garthac.com

The RPG-SoundMixer - A commercial program (Demo available) for Windows specifically designed for creating musical and acoustic backgrounds for roleplaying sessions. [English/German]
http://www.rpgsoundmixer.com/

Battlegrounds Games - A virtual tabletop software that allows to play any RPG online or offline. It is cross-platform, and includes features like Fog of War.
http://www.battlegroundsgames.com/

The Roleplaying Assistant - Freeware tool featuring character generator (for Dungeons and Dragons, Alternity, Star Wars, in Nomine Satanis), fractal world generator, dungeon mapper and spell management.
http://www.rpgweb.com

kLoOge.Werks - The Digital Gaming Table - A commercial Java tool which allows playing round based and map using game to be played with a computer.
http://www.kloogeinc.com/

Dices - Open source online role playing software offering game profiles management for several games, die launch module, a map editor with support for placing players and NPCs on a map, automated recording of logs and notes management.
http://dices.sourceforge.net/

Marnok's Adventure Generator - Generates random adventure ideas. Each includes an overall theme, adventure hooks, goals, major and minor villains, and optional twists.
http://marnok.com/?content=content/Role%20Playing/Adventure%20Generator.htm

Dire Press RPG Tools - Random generators for use with d20 fantasy and other role-playing game systems.
http://direpress.bin.sh/tools/

Role Playing DB. - A commercial roleplaying database manager for Linux and Windows.
http://www.deepsoft.com/cgi-bin/deepwoods.cgi/RolePlayingDB

Obsidian Portal - Online campaign hosting and collaborative content database. Users can host a campaign weblog that ties in with tools for tracking NPCs, items, and other game content.
http://www.obsidianportal.com

GDSWare - Features WhosNext, an utility which is intended to help running combats with rolling for inititive and keeping track of damage for multiple characters.
http://www.geocities.com/gdsware/

Fantasy Grounds - An application acting as a virtual online gaming table primarily intended for pen and paper style narrative role playing games. [Windows XP/2000]
http://www.fantasygrounds.com