After years of waiting and gamboling, Myst Online / Uru has opened the source to their client and 3d max plugin. At the same time, an open source replacement server has also been made available, so it's basically the whole package, minus the artwork.
They also re-opened their servers for anyone to play for free, so sign up, check it out, and donate! Unfortunately no Linux support at the moment, but hopefully a porting effort gets started soon (linux client here: http://plasmaclient.info ?)
To contribute, check out their development site here: http://www.openuru.org/
Edit: Kaelis, a long time community member, asked people to check out https://github.com/H-uru/Plasma as well, being run by a different group of people
They also re-opened their servers for anyone to play for free, so sign up, check it out, and donate! Unfortunately no Linux support at the moment, but hopefully a porting effort gets started soon (linux client here: http://plasmaclient.info ?)
To contribute, check out their development site here: http://www.openuru.org/
Edit: Kaelis, a long time community member, asked people to check out https://github.com/H-uru/Plasma as well, being run by a different group of people