
Massively considers a game to be in open testing if it has open, public signups and plans for a server wipe before its official launch. Self-described "open beta" MMOs that have soft-launched with functioning real-money cash shops or that have lingered in development stasis an excessive length of time will not be listed.
Archlord 2 (Webzen): Announcement, Signup
Face of Mankind (Nexeon): Signup
Legend of Silkroad (JC Planet): Announcement, Signup
Margonem (Garmory): Signup
Project Gorgon (Project Gorgon): Signup
Strife (S2 Games): Announcement, Signup
Taikodom (Gamersfirst): Announcement, Signup
Wakfu (Ankama): Signup

We consider an MMO to be in closed testing if it features either future test signups or an ongoing semi-private beta/alpha that cannot immediately and freely be accessed by the general public. Some are restricted by NDAs. Games qualify even if the testing is limited to backers or pre-purchasers and if has an active cash shop as long as the signups are restricted.
Albion Online (Sandbox Interactive): Announcement, Signup (alpha)
Argo Online (Games-Masters): Announcement, Signup (closed beta)
Auto Club Revolution (Eutechnyx): Announcement, Signup (closed beta)
Beasts of Prey (Octagon): Announcement, Early Access (alpha)
Black Desert (Pearl Abyss): Announcement (Korean closed beta)
Camelot Unchained (CSE): Announcement (backer pre-alpha)
Das Tal (Fairytale Distillery): Announcement, Signup (alpha)
DayZ (Bohemia Interactive): Announcement, Signup (early access)
Dungeon Fighter Online (Neople): Announcement, Signup (alpha)
Earthrise: First Impact (SilentFuture): Announcement, Signup
Eclipse War Online (Playwith Interactive): Announcement, Signup
Echo of Soul (Aeria): Announcement, Signup
Elite: Dangerous (Frontier): Announcement, Early Access (beta 2; beta 3 begins Oct 28)
Gloria Victis (Black Eye): Announcement (donor alpha)
Heroes of the Storm (Blizzard): Announcement, Signup (technical alpha)
HEX (HEX Entertainment): Announcement, Signup (unofficial open beta)
Kingdom Online (NTT Game): Signup (closed beta through July 30)
Landmark (SOE): Announcement, Signup (paid closed beta)
Legion of Heroes (Nexon): Announcement, Signup (closed beta)
Line of Defense (3000AD): Announcement, Signup (early access)
MyDream (MyDream): Announcement (closed testing open to donors)
Nosgoth (Square Enix): Signup (closed beta)
Oort Online (Wonderstruck): Announcement (donor alpha)
Origins of Malu (Burning Dog): Announcement
Otherland (Drago): Announcement, Signup (taking signups)
Pathfinder Online (Goblinworks): Announcement (paid "early enrollment" alpha delayed)
Shadowrun Online (Cliffhanger): Announcement (Steam early access)
Shards Online (Citadel Studios): Announcement (pre-alpha)
Shroud of the Avatar (Portalarium): Announcement (in donor testing)
Skyforge (Obsidian): Announcement, signup (technical beta weekends)
Star Citizen (Cloud Imperium): Announcement (backer pre-alpha dogfighting module)
Starlite (Project Whitecard): Announcement, Signup (fka Astronaut: Moon, Mars, and Beyond)
The Crew (Ubisoft): Announcement, Signup (launching December 2nd)
The Repopulation (Above and Beyond): Announcement, Signup, /r/
Tribal Wars 2 (Innogames): Announcement, Signup (closed beta)
TUG (Nerd Kingdom): Announcement, Signup (Steam early access)
Valiance Online (SilverHelm): Announcement (pre-alpha early access)
Venus Rising (FoxySoft): Announcement (in internal alpha; adult MMO/NSFW)
Warlords of Draenor (Blizzard): Announcement, Signup (closed beta, releasing 11/13/14)
Betawatch is Massively's weekly report on the latest MMO alphas, betas, and other games still meandering toward an official launch. From ArcheAge to WildStar, it's covered here, complete with sign-up links so that you too can perform the unpaid quality-control work otherwise known as game testing. Drop us a comment if we've missed one, and many thanks to Steven Eyerman for the Subreddit links