Open Game Systems

From RPGnet
Revision as of 07:35, 28 March 2017 by Tukkek (talk | contribs) (big clean up without removing any content)
Jump to: navigation, search

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

Definition: What is an Open License?

This page operates under the following definition:

An Open License allows the free and perpetual re-use of original material by anybody willing to follow the restrictions of said license, without an explicit contact or negotiation between original author and licensee.

In other words, if something is available under an open license, I can use and re-use it for freely as long as I respect the terms of each individual license.

The List:

The following systems are available under an open license and are thus free to use for any activity, from playing to publishing new products (books, video games...) using the system. Note that details may vary from license to license so make sure you read and understand its details before using a system.

d20 Open Game License

Note that the official d20 SRD for D&D 3e has been revoked. It has been replaced by Paizo's Pathfinder SRD, which is compatible with previous d20 material and still being used for publication of new products by the community by many companies.

d20 System based

Fudge based

Other systems


Retro-clones are new games that are compatible with older games now out-of-print, allowing for the use of previous material without having to acquire a possibly rare and/or expensive copy of the original game or resorting to piracy. These are part of a larger movement known as the Old-School Renaissance (OSR).

OGL with trademark 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.

  • Mutant Future (OGL and Mutant Future Trademark License)
  • GORE (OGL and GORE License)
  • FUDGE (OGL and FUDGE System Trademark License; also under its own license)
  • vsM Engine

Creative Commons licenses

GNU licenses

  • Gods and Monsters (GNU Free Documentation License)
  • Circe (GNU Free Documentation Licence and GNU General Public License)
  • Fringe (OpenOffice Writer format) (GNU General Public License)

Other licenses

External links