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OpenSim is a BSD Licensed Open Source project to develop a functioning virtual worlds server platform capable of supporting multiple clients and servers in a heterogeneous grid structure. OpenSim is written in C#, and can run under Mono or the Microsoft .NET runtimes.


Latest News

OpenSim 0.4 Released!

The OpenSim team is happy to announce the first alpha release of OpenSim, version 0.4. This release focuses on stand alone mode (with one or more regions). Some stuff works, a lot doesn't. If it breaks, you get to keep both pieces.

Stuff that works:

  • standalone mode with one or more regions
  • basic physics (no object collisions)
  • persistence of users, prims, assets, and inventory via sqlite
  • basic building, custom texture uploads
  • avatar editing

More advanced physics, in world scripting, grid mode, and support for other database backends are not supported in this release, though they may work from time to time before crashing with an earth shattering kaboom! All of these are under active development, and are being worked on for the 0.5 release.

Source distributions in both .tar.gz and .zip can be found at the OpenSim Downloads site.

Getting Started with OpenSim

OpenSim Development

The OpenSim Team is currently working towards the 0.5 release of OpenSim.

Recent Changes

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Handy Documentation

Participating in the OpenSim Community

OpenSim is an open source project. This means that it is developed by anyone who wants to participate. This could be you! We welcome testers and developers alike.

If you need help or want to help the best way to get in touch is IRC (chat network). There is a lot of activity there every day.

Additionally, there are at least two public grids and several standalone arrays running 24/7.

deepgrid -, Create an account at no charge and invoke the sl client with "-loginuri".

osgrid -, Create an account at no charge and invoke the sl client with "=loginuri".

Zion - Standalone array. "-loginuri", use "Testa User" through "Testz User", password "test".

Apex - Standalone array. "-loginuri", use "Testa User" through "Testz User", password "test".


  • IRC on EFNet, channel #OpenSim. Download an IRC client like X-Chat and go to EFNet (server, channel #OpenSim. If you already have an IRC client installed you can just follow this link.


There are a number of mailing lists of interest to OpenSim users

Source Code

Anon Checkout

svn co

Developer Checkout

svn co svn+ssh://


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