Myst: Masterpiece Edition was an updated version of Myst, with re-rendered images in true color (million colors) instead of 256, newly rendered point-of-view images, better audio effects and music, a hint system and maps. Myst: Masterpiece Edition was released on August 24, 1999 and for the Mac around June 22, 2000.
realMyst: Interactive 3D Edition was a re-make of Myst, featuring various changes over the original:
realMyst for the PC was released around November 20, 2000, and the Mac version around March 30, 2002. realMyst was developed by Cyan, Inc. and Sunsoft, and published by Ubisoft, and regarded by some as a test project for the then-in development Uru: Ages Beyond Myst.
On May 5th, 2009, Myst was released for the iPhone and iPad. realMyst followed a few years later on June 8th, 2012.
realMyst: Masterpiece Edition, a visually enhanced revision running on the Unity engine that also includes the graphics of the original Myst game, was released on Steam on February 5, 2014. The remake was updated to v2.0 on January 28, 2015, receiving a significant graphical overhaul, in which several bugs were fixed and the detail of many models and textures was upgraded.