With the proliferation of open-license games, it can be difficult to keep track of what has been released. In particular, the system found in original SRD (i.e. the fantasy SRD released in 2001) was also used for a number of purely closed-content games. Some games released using this system use the "D20" logo, but others do not. Some identify using an "OGL" logo for the WotC Open Gaming License, though there are multiple systems released under this license.
What follows is a list of games which are based on the basic system outlined in the original fantasy SRD. It is not complete, but it should give an idea of where to look.
- Armageddon 2089 Roleplaying Game (Mongoose Publishing)
- A near-future sci-fi RPG concentrating on mek-based warfare and the mercenary/corporate companies who use them.
- Blood and Space (RPG Objects)
- A "d20 Starship Adventure Toolkit" for d20.
- Call of Cthulhu (Wizards of the Coast)
- A standalone game based on the works of H.P. Lovecraft, adapting from the RPG from Chaosium. This uses the d20 logo but is not OGC.
- Cloak of Steel: Gigantic Metal Warriors Clash in the World of Tierplana (Postmortem Studios)
- A fantasy RPG with magically-powered giant robots and airships. It uses the "Live System" -- a more free-flowing variant of the d20 System.
- Conan: The Role-Playing Game (Mongoose Publishing)
- A licensed RPG based on the writings of Robert E. Howard, which uses the OGL and the SRD, but not the d20 logo.
- D20 Modern (Wizards of the Coast)
- A standalone modern fantasy game with its own separate SRD released as open content.
- Deeds Not Words (Cryptosnark Games)
- A small-press superhero RPG.
- Digital Burn (Living Room Games)
- A near-future setting and cyberpunk sourcebook for use with the D20 Modern game. Released using the OGL and D20 trademark.
- Dungeons & Dragons, 3rd edition and 3.5th edition (Wizards of the Coast)
- The most popular tabletop RPG on the market, a medieval fantasy RPG with dozens of settings available.
- Engel (White Wolf)
- A biblical fantasy RPG set in the future when the End Times arrive.
- EverQuest RPG (White Wolf)
- This is a standalone fantasy RPG based on the SRD system. Released using the OGL only.
- Farscape RPG (Alderac Entertainment Group)
- An adaptation of the science-fiction television series. Released using the OGL and D20 trademark.
- Godlike (Hobgoblynn Press)
- An alternate-history RPG of gritty superheroes in World War II. This is a standalone game which includes alternate OGL rules based on the SRD.
- Judge Dredd RPG (Mongoose Publishing)
- An adaptation of the far-future urban action comic book. Released using the OGL and D20 trademark.
- Mutants & Masterminds (Green Ronin Enterprises)
- This is a standalone superhero RPG based on the SRD with major changes. Released using the OGL only.
- Silver Age Sentinels d20 (Guardians of Order)
- A superhero RPG set in modern times with some of the flavor of earlier, "Silver Age" comics. Released using the OGL and D20 trademark.
- Sláine: The Role Playing Game of Celtic Heroes (Mongoose Publishing)
- A fantasy RPG set in a mix of Celtic myth and prehistory. Released using the OGL and D20 trademark.
- Spycraft (Alderac Entertainment Group)
- A modern superspy genre RPG. It includes complete skill, feat, and combat rules in the core book -- but still refers to the D&D Players Handbook for a few basics of character generation and advancement. Released using the OGL and D20 trademark.
- Star Wars Roleplaying Game (Wizards of the Coast)
- Based on the George Lucas film series. It uses a variant of the system in the SRD but does not use the OGL.
- Traveller20 (QuikLink Interactive)
- This is an adaptation of the classic 1970's RPG, "Traveller" to the d20 system. It was released using the OGL and D20 trademark.
- Wheel of Time RPG (Wizards of the Coast)
- This is a standalone fantasy RPG based on the series of novels by Robert Jordan. It uses a variant of the system in the SRD but does not use the OGL. Support for the game was dropped by Wizards of the Coast.