The d20 System is a role-playing game system published in 2000 by Wizards of the Coast originally developed for the third edition of Dungeons & Dragons. The system is named after the 20-sided dice which are central to the core mechanics of many actions in the game.
The Generic Universal RolePlaying System, or GURPS, is a tabletop role-playing game system designed to allow for play in any game setting. It was created by Steve Jackson Games and first published in 1986 at a time when most such systems were story- or genre-specific.
HeroQuest is a role-playing game written by Robin D. Laws first published as Hero Wars by Issaries, Inc. in 2000. It has its roots in Greg Stafford's fantasy world of Glorantha, but was designed as a generic system, suitable for, but not tied to any particular genre.
Numenera is about discovering the wonders of the worlds that came before, not for their own sake, but as the means to improve the present and build a future. With streamlined, intuitive rules, the Numenera tabletop roleplaying game allows players to create characters in minutes, emphasizes imagination and narrative, and features an elegant, flexible, and powerful rules set.
Rifts is a multi-genre role-playing game created by Kevin Siembieda in August 1990 and published continuously by Palladium Books since then. Rifts takes place in a post-apocalyptic future, deriving elements from cyberpunk, science fiction, fantasy, horror, western, mythology and many other genres.
RuneQuest: Roleplaying in Glorantha is a roleplaying game set in the world of Glorantha, a heroic fantasy setting rich in magic, mystery, and extraordinary adventure. The setting, Glorantha, is one of the oldest, most detailed, and most influential roleplaying settings ever published, and the rules are similarly acclaimed.
Savage Worlds is a generic role-playing game and miniatures wargame written by Shane Lacy Hensley and published by Pinnacle Entertainment Group. The game emphasizes speed of play and reduced preparation over realism or detail. The game received the 2003 Origin Gamers' Choice Award for best role-playing game.
Roleplaying (RP), or Role Playing, in World of Warcraft means taking on the role of a character and acting it out in-game through emotes, /say, /yell, and sometimes other channels. Players may also participate in roleplay outside the game by posting on blogs, wikis, or forums (official or otherwise).