http://opensimulator.org/wiki/Grid_List
Other Major OpenSimulator based grids (in order of approximate size):
- ScienceSim
- The New World Grid (English/French)
- FrancoGrid (French)
- MyOpenGrid
- Metropolis
- ReactionGrid
- Cyberlandia (Italian)
- Open Neuland (German)
- Meta7
- WorldSimTerra (English/Portuguese)
- 3rd Rock Grid
- InWorldz
- Role Play Worlds
- Open Life Grid
- SpotOn 3D
- Grid4Us (German/English)
- Avatar Hangout
- Virtyou (English/German/Dutch)
- Twisted Sky
- Pseudospace
- Your Alternative Life (English/German)
- Wilder Westen (German/English)
- GiantGrid (English/French)
- Eden Realm
- ONGENS
- Tertiary Grid
- German Grid (German)
- New Zealand Virtual World Grid
- Unica Universe(Italian)
- Logicamp
- My 3D World
- Land of the Vikings (German/English)
- V-Business
- DW Grid
- Heritage Key
- Tlön
- Virtual Univ. of Edinburgh
- Jamland (German)
- Jokaydia
- UFS Grid
- Rezzable Alpha
- AnSky
- Open Kansai (Japanese)
- Emerald Network
- Austria Grid (German/English)
- Cybergrid.de (German)
- 2lifeGrid (German)
- Segarra Grid
- FunGrid (German)
- GovGrid