List of free multiplayer online games Free and open-source Free and open-source

| Developers | Release_date | Required_OS | Payment | Type_ |
|---|---|---|---|---|
| Microsoft Research | March 16, 2000 | Windows | Free to play | 3D |
| Zeonix | January 2003 | Windows | Free to play | 2D |
| Open Source | January 5, 1996 | Linux | Free to play | 2D |
| Omerta Game Limited | 26 September, 2003 | Browser-based | Free to Play | Text |
| Open Source | August 19, 2005 | Windows , OS X , Linux | Free to Play | 3D |
| Virgin Interactive | November 30, 1997 | Windows | Free to play | 2D |
| Open Source | August 5, 2000 | Windows , OS X , Linux | Free to Play | 3D |
| Virtonomics Co. | May 30, 2009 | Windows | Free to play | Text |
| Open Source | December 23, 2010 | Windows , OS X , Linux | Free to Play | 3D |