- Home: http://opensimulator.org/wiki/Main_Page
- Inspiration: Second Life
- State: beta
- Download: http://opensimulator.org/wiki/Download
- Keyword: simulation, content open
- Code repository: https://github.com/opensim/opensim.git (@created 2009, @stars 229, @forks 145)
- Code language: C#
- Code license: 3-clause BSD
- Code dependency: MonoGame
- Assets license: ? (BSD)
- Developer: 3di, Adam Frisby, Adam Ivie, Adam Johnson, AdilElFarissi, Ai Austin, AlexRa, Alicia Raven, "BlueWall (James Hughes)", Christian.K.72, dahliaT, Dan Lake, David Rowe, Diva Canto, Fernando Oliveira, Fly Man, Geir Nøklebye, genkii, Homer Horwitz, Jak Daniels, jeff-kelley, John Hurliman, Jonathan Freedman, kcozens, kunnis, Latif Khalifa, lbsa71, Magnuz Binder, Marck00, Matthew Beardmore, Melanie Thielker, Mic Bowman, Michael Cerquoni, Michael Cortez, Mike Mazur, MW, opensim-mirror, Oren Hurvitz, Robert, Robert Adams, Sean Dague, Sean McNamara, SignpostMarv, Snoopy Pfeffer, speedlimits, szielins, Tedd, Teravus, Tom the Dragon, TomMeta, Ubit Umarov, ¡Cinder! ㊝
Server side implementation of an open virtual 3D world in which users can create their own content. It was founded in 2007 as an open source alternative to Second Life and is compatible to Second Life clients.