Alternity is a science fiction role-playing game (RPG) published by TSR in 1998. Following the acquisition of TSR by Wizards of the Coast, the game was discontinued in 2000 as part of a broader rationalisation of TSR's business holdings, but it retains a small and devoted fanbase. Parts of Alternity as well as TSR's classic Star Frontiers game have been incorporated into the d20 Modern game, especially the d20 Future setting. The first campaign setting for the Alternity game, the Star*Drive setting, was introduced in 1998.

d20 Modern is a modern fantasy role-playing game system designed by Bill Slavicsek, Jeff Grubb, Rich Redman, and Charles Ryan. The system's core rulebook was published by Wizards of the Coast on November 1, 2002; by 2006, ten additional supplements were released. The game is based on the d20 System and the Dungeons & Dragons 3rd Edition ruleset. It includes various campaign settings along with the tools to build campaigns in modern/contemporary settings.