The d20 System is a system of game mechanics for role-playing games published in 2000 by Wizards of the Coast and based on the original Dungeons & Dragons game created by Gary Gygax and Dave Arneson. The system is named after the 20-sided die which is central to the core mechanics of the system.
Much of the d20 System was released as the System Reference Document (SRD) under the Open Game License (OGL) as open gaming content, which allows commercial and non-commercial publishers to release modifications or supplements to the system without paying for the use of the system's associated intellectual property, which is owned by Wizards of the Coast.
d20 Resources
- The d20 System
- The Official Website of the d20 Game Engine and the Open Gaming License
- The Hypertext d20 SRD
- The Ultimate d20 System Reference
- d20 System - Wikipedia Entry
- From Wikipedia, the free encyclopedia.
- Pathfinder Roleplaying Game
- A new RPG based on the Open Game License (OGL) and the 3.5 SRD released by Wizards of the Coast.
Pathfinder RPG
via Paizo.com
Get updates on the Pathfinder Roleplaying Game, a tabletop fantasy roleplaying game that will serve as the anchor for Paizo Publishing's popular line of Pathfinder adventures, sourcebooks, and campaigns.
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Magic Lantern Guides: Pentax K20D
Amazon Price: $13.57 (as of 12/24/2009) 
d20 Modern Roleplaying Game: Core Rulebook
Amazon Price: (as of 12/24/2009)
d20 Past (d20 Campaigns: d20 Modern)
Amazon Price: (as of 12/24/2009)
d20 Menace Manual (d20 Campaigns: d20 Modern)
Amazon Price: (as of 12/24/2009)
d20 Future (d20 Campaigns: d20 Modern)
Amazon Price: (as of 12/24/2009)
d20 Future Tech (d20 Modern Supplement)
Amazon Price: (as of 12/24/2009)
D20 Weapons Locker (d20 Campaigns: d20 Modern)
Amazon Price: (as of 12/24/2009)
d20 Apocalypse (d20 Campaigns: d20 Modern)
Amazon Price: (as of 12/24/2009)
A Short Course in Canon EOS 20D Photography (Book & CD-ROM)
Amazon Price: $36.95 (as of 12/24/2009)
Canon EOS 20D (Magic Lantern Guides)
Amazon Price: (as of 12/24/2009)
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