See also How to Play. For a list of historical shards, see the Guild of Archivists’ wiki page.
Myst Online: Uru Live (again)
Maintainer: Chogon
Cyan’s official Uru Live shard, often referred to as MOULa.
Minkata Prime and Alpha
Maintainer: Rarified
A pair of Cyan-like shards maintained by OpenUru.org, meant for adapting/testing patches and fan Ages to be added in MO:ULa.
Gehn
Maintainer: Hoikas
The Guild of Writers’ bleeding edge (but not testing) shard, with various improvements (in the process of being ported to MOULa) like accents in chat, improved audio chat, better visuals. It has an old version of the Fehnir House fan Age, not yet on MOULa.
Deep Island
Maintainer: Diafero
A shard that requires the offline (Uru: CC) version of the game as client. It has the largest collection of fan Ages.
The Open Cave (MOUL)
Maintainer: (Mystler)
A shard that includes a crazy, fun modifications of Ae’gura named the City of Dimensions, a boat trip around the Lake, and a pet. It has an old version of the Fehnir House fan Age, not yet on MOULa.
Keep in mind that the shard will not be updated for the foreseeable future.
The Open Cave (PotS)
Maintainer: (Mystler)
Distinct from the one above (you will also need a separate login), similar in many ways to Deep island. Fan Ages must be installed with Drizzle, and includes a few Ages not available elsewhere.
Keep in mind that the shard will not be updated for the foreseeable future.
Destiny
Maintainer: Mystler
A shard meant only for alpha-testing fan Ages, thus not intended for regular gameplay; some areas (like Ae’gura) are in their default state, with barriers on.