Created for Dungeons & Dragons 3.5 but adapted into a great many game systems because it was given something like an open source license used in software.
Originally Published by Wizards of the Coast. Because of it’s universal applicability and the strong commercial drive they had shown, a great many other game systems have chosen to release their later revisions in this system.
Resources ∞
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Necromancer Games [ 1 ] https://web.archive.org/web/20090228203820/http://necromancergames.com/
- Had D20 Products with “Third Edition Rules, First Edition Feel”
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Sword & Sorcery [ 2 ] (I’m not sure when would be the most accurate snapshot in time) https://web.archive.org/web/20081225055721/https://www.swordsorcery.com/
- Was the largest independent publisher of d20 material
Footnotes
| ^ 1 | https://web.archive.org/web/20090228203820/http://necromancergames.com/ |
| ^ 2 | (I’m not sure when would be the most accurate snapshot in time) https://web.archive.org/web/20081225055721/https://www.swordsorcery.com/ |
ported