Simutronics is an American online games company whose products include GemStone IV and DragonRealms. It was founded in 1987 by David Whatley, with husband and wife Tom & Susan Zelinski. The company is located in St. Louis, Missouri. It became part of the Stillfront Group in 2016. The company's flagship product is the text based game, GemStone IV, which went live in November 2003, with predecessor games running back in 1988. GemStone was originally accessed through General Electric's internet service provider GEnie, later becoming accessible through AOL, Prodigy, and CompuServe before Simutronics finally moved all their games to their own domain in 1997.

Simutronics products

Multiplayer online games

Mobile games

HeroEngine

HeroEngine is a 3D game engine and server technology platform developed specifically for building MMO-style games, based around a system similar to the IFE using the Hero Script Language (HSL). Originally developed for the company's own game Hero's Journey - which never made it to the testing stage - the engine has since been licensed by other companies. Simutronics sold the HeroEngine to Idea Fabrik, Plc. on August 5, 2010.

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