Cyan just released Myst III and IV on the Steam store so not they are available along with the rest of the series from both GOG and Steam! They’ve also updated the rest of the games to give make them compatible on Windows 10 and re-added support for a number of languages.
Myst III Exile and Myst VI Revelation for the first time have been digitally released through gog.com with updated compatibility for Windows 7-10! If you go to the gog.com website you will see it first thing!
Cyan just released their first ever 3d printable Myst models! You can see the choices such as the Library and Marker switches at the link below!
Cyan Inc. made a Myst VR(virtual reality) proof of concept that you can check out screenshots from below; it includes one panoramic that lets you look around.