Open Game Systems

This page collects all the games under an open license like the Open Game License and various Creative Commons Licenses.

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Retroclones

Retro-clones are new games that are compatible with games that are now out-of-print. They are listed separately to the other games.

The List:

The following systems are available under an open license and are thus free to use in your own publications. (Though with varying restriction on the use of the material.)

Retro-Clones

• OSRIC (download) (OGL and OSRIC Open License) (based on 1E D&D)
• Labyrinth Lord (download) (OGL and Labyrinth Lord Trademark License) (based on B/E D&D)
• Swords & Wizardry (download) (OGL and the Swords & Wizardry Compatability Statement License) (based on 0E D&D)
• Swords & Wizardry Whitebox (download) (OGL and the Swords & Wizardry Compatability Statement License) (based on whitebox D&D)
• 4C System (download) (Public Domain; Direct link to file) (based on the Marvel RPG)
• Warrior & Wizard (download CC or OGL version) (Creative Commons Attribution-ShareAlike; Direct link to file) (based on The Fantasy Trip)

Open Game License (Direct Link)

• BFRPG, Basic Fantasy Role-Playing Game.
• Modern d20 SRD
• d20 Anime SRD (direct link to file)
• Fate 2.0 (direct link to the file)
• Spirit of the Century
• Action! System
• Runic, Runequest RPG
• Iridium System

Open Game License and Another License

These games release their material as Open Game Content, but also provide another, more restricted, license to allow publishers to refer to Product Identity.

• d20 System 3.5 SRD, Dungeons and Dragons (OGL and d20 System License)
• Mutant Future (OGL and Mutant Future Trademark License)
• GORE (OGL and GORE License)
• Wayfarers (OGL and open-ended agreement)
• Prometheus SRD (OGL and Prometheus License)
• FUDGE (OGL and FUDGE System Trademark License; also under its own license)
• Mutants & Masterminds (OGL and M&M Superlink)
• True20 (OGL and True20 Adventure Roleplaying Trademark License)
• Spellchrome (OGL and Non-Open Game Content)

Creative Commons Licenses

• Drowning and Falling (Attribution/Non-Commercial/Share-Alike)
• The Shadow of Yesterday (Attribution)
• Donjon (Attribution/Share-Alike)
• Wushu Open (Attribution)
• Wushu Open Reloaded (Attribution/Share-Alike)
• Shadows (Attribution)
• Myriad (Attribution)
• Organic Rules Components (ORC) (Attribution)
• Violence (Attribution/Non-Commercial/Share-Alike)
• Star Wreck (Attribution/Non-Commercial/Share-Alike)
• Noteworthy (Attribution/Non-Commercial)
• Executive Decision (Attribution/Non-Commercial/Share-Alike; direct link to file)
• ...in Spaaace! (Attribution/Non-Commercial/Share-Alike; direct link to file)

GNU free documentation license

• Gods and Monsters
• Circe (also GNU General Public License)

Other

• Dominion Rules (Dominion Rules Licence)
• Action! System (Action! System Open License)
• Active Exploits (Active Exploits Distribution and Expansion License)
• Redbox Hack (license unclear; readers told to "do what you'd like with the thing").