RPG MMOs Using Unity Web Player? None—It's Discontinued (2017)

Zero active RPG MMOs use Unity Web Player. Unity deprecated Web Player in 2017 (removed in Unity 5.4+). Browsers dropped NPAPI plugin support. No new games can run on it; old ones are unplayable.

Modern Alternatives (Unity-Based or Similar)

• WebGL Builds: Unity games now export to WebGL (runs natively in browser). Search itch.io, Game Jolt, CrazyGames for "Unity MMORPG" or "WebGL MMO."
• Downloadable Unity MMOs: Many indie MMOs use Unity but require client download (e.g., Albion Online—though it's custom engine now).
• Top Modern MMORPGs (Non-Unity):
  • World of Warcraft (Custom engine)
  • Final Fantasy XIV (Crystal Tools / Luminous)
  • Black Desert Online (Custom)
  • Guild Wars 2 (Custom)
  • Elder Scrolls Online (HeroEngine)

For browser-based, filter for WebGL on itch.io/Game Jolt. For full MMOs, download a modern client.