text: Regnum Online – A 3D fantasy game, free-to-play with premium content.
  RuneScape – Java fantasy 3rd person MMORPG.
  Salem – An isometric, 3D fantasy game with a focus on crafting and permadeath.
  Shroud of the Avatar – An isometric, 3D fantasy game and the spiritual successor to Ultima Online.
  Spiral Knights – Java fantasy 3rd person game.
  The Saga of Ryzom – has a Linux client and source code available.
  Tibia – A 2D Medieval fantasy MMORPG game. Free-to-play with premium content. One of the oldest MMORPG, created January 1997. With Official Linux client.
  Ultima Online has an unofficial Linux client.
  Vendetta Online – A 3D spacecraft MMOFPS with growing RPG elements, pay to play. Maintains both Linux/32 and Linux/64 clients.
  WorldForge – A game engine. There are Linux clients available.
  Wyvern – A 2D fantasy MMORPG that runs on Java.
  Yohoho! Puzzle Pirates – A puzzle game which runs on Java.
  Many Virtual Worlds – (such as Second Life) also have Linux clients.
  Types of Linux gaming
  Linux gaming can be divided into a number of sub-categories.
  Libre gaming
  Libre gaming is a form of Linux gaming that emphasizes libre software, which often includes levels and assets as well as code.