RolePlayingMaster
- Software for players and dungeonmasters to generate characters, build adventures and craft full campaigns.
- http://www.enworld.org/RolePlayingMaster/

Andargor's Home
- Site contains an HTML searchable index of the 3.5 SRD, a windows help version of the 3.5 SRD, and now hosts the updated versions of Jamis Buck's NPC Generator.
- http://www.andargor.com/

RPGXplorer
- Professional character generation and rules database tool for fantasy role-playing games based on the Open Game License. Uses version 3.5 of the System Reference Document.
- http://www.rpgxplorer.com

Hero Workshop D&D 3e Character Generator
- A shareware D20 character generator that features much of the material available for the D20 system. Has a working trial, but requires payment for a full version.
- http://www.heroworkshop.co.uk

Asmor's D&D Scripts
- Demi-plane generator, martial arts technique generator, and monster and monster advancement generators.
- http://asmor.homeip.net/dnd.php

Javascript D&D 3.5 Character Generator
- Generates a full character sheet directly from your browser.
- http://www.pathguy.com/cg35.htm

dgsh - A D20 Dungeon Shell
- A software tool that allows the dungeonmaster to track their party and their opponents with simple commands. It runs on any Java 1.4.x virtual machine.
- http://dgsh.sourceforge.net/

Gnomish Inventions
- Gives an online creation system for gnomish inventions in the DragonLance setting, but can be exported to any system.
- http://www.kencyclopedia.com/kender/inventions/

Asmor
- Demi-plane generator, martial arts technique generator, and monster and monster advancement generators.
- http://asmor.homeip.net/main.php

NPC Generator
- Character, town, dungeon, and treasure generator.
- http://www.aarg.net/~minam/npc.cgi

PCGen
- An open source java based character generator with rules for many d20 based games.
- http://pcgen.sourceforge.net

DM Genie
- Software suite for the d20 RPG allowing the creation and tracking of adventures and battles.
- http://www.dmgenie.com

d20 PlayersMap Software
- Contains a download for playing online using chat and graphics. [Registration required]
- http://groups.yahoo.com/group/d20map/

D&D XML Tools
- A project to create a XML format for D&D spells and monsters, and to encourage the development of software using that format.
- http://dndxml.sourceforge.net/