Realmz is a fantasy adventure and role-playing video game first developed and published by Fantasoft in 1994 for the Apple Macintosh as shareware. Fantasoft released a Microsoft Windows-compatible version in 1999, and a science fiction role-playing game based on the Realmz engine, titled New Centurions, in 2001. Realmz was originally written by Tim Phillips on a Macintosh IIsi; he also wrote four game scenarios, including the introductory scenario "City of Bywater". Other original scenario contributors were Jim Foley (who wrote two scenarios, namely "Castle in the Clouds" and "White Dragon") and Sean Sayrs (who wrote three, including "Prelude to Pestilence" and "Griloch's Revenge").
Realmz is similar to the Exile series by Spiderweb Software which features similar gameplay and graphics, and both were originally published by Fantasoft.
Custom Realmz game scenarios can be created with a tool called Divinity - also produced by Fantasoft, LLC. A special version of Realmz - Divine Right - is useful in conjunction with Divinity. It is the debugger software for user-created scenarios.