Myst Online: Uru Live is a free and open-source massively multiplayer online role playing game (MMORPG) developed by Cyan Worlds, being the multiplayer version of the 2003 Uru: Ages Beyond Myst by Ubisoft. There are many vast and fantastic worlds to explores, whilst uncovering new areas and new information at every turn.
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Mac OS X 10.6 or newer
Free download at paulthetall.com