Developer Documentation

From OpenSimulator

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Source Code Repository Access

OpenSimulator uses git as its source code repository. Checkout

git clone git://

See Source Code Repository for more details.

See Using Git for more Details on installing and using GIT with

You can also browse the source code for OpenSim using a web browser.

We have Ohloh page, which takes various statistics of the OpenSimulator code base.

This is also a opensim-libs SVN repository which contains the source code to some of the 3rd party libraries built and included in OpenSim.

Submitting Patches

Please review Submitting code to OpenSim

Developer Documentation

Please be aware that some of this documentation may be out of date. If this appears to be the case then please ask for more information on the mailing lists or IRC channels (details are on the Main Page). If you can't find what you want here you might want to try looking in the User Documentation.


Development Services


Client Stacks

  • Sim Throttles — Information on how OpenSim handles throttling of packets to the client.

Communication Protocols


  • Database Documentation — Information on the database schemas used in OpenSim
  • MonoSqlite — How the database model currently works.
  • LSL:PrimitiveParams — Notes on converting SL Edit GUI values and LSL PrimitiveParams to OpenSim PrimitiveBaseShape fields

File formats




  • Region module basics - The basics of how to create a region module, and where example code can be found in the OpenSim source tree.





  • Scripting_Documentation — How to use scripts and what limitations apply.
  • LSL_Status — A list of LSL-functions that are available in OpenSim.
  • OSSL — Some information about the OpenSimulator Scripting Language, and how to implement an OSSL function
  • OpenSim.Region.ScriptEngine — How the ScriptEngine looks internally.





Web Integration

Feature Proposals

If you want to propose a feature, you should do so on the opensim-dev mailing list. If there is interest or if you plan to write the code yourself, you can create a page here. Please do not propose features in the Mantis bug tracker. Please do not propose features if you don't have a clear idea of how they would work on a technical level. Please do not propose features expecting other people to do the implementation work without convincing them first - this will not happen.





A good first point of contact is the OpenSim IRC, on channels #opensim / #opensim-dev / #osgrid / #opensim-scripting. The OpenSim developers hold office hours once a week in-world on Tuesdays at "Wright Plaza" on OSGrid. There is a "Test Hour" on Saturdays, also generally on "Wright Plaza". Both these weekly events are held at 1900UTC in summer time and 2000UTC in winter. Check on the #opensim IRC channel on Freenode just before each of these events if there is any confusion.

There is also a mailman email distribution list available at

Recent Git Commits

tests: windows does not have 1ms time resolution (UbitUmarov) (Wed, 16 Oct 2019 12:16:59 -0700)
tests: windows does not have 1ms time resolution UbitUmarov <ajlduarte at sapo dot pt> .../ScriptEngine/Shared/Tests/LSL_ApiUserTests.cs
fix some texts init (UbitUmarov) (Wed, 16 Oct 2019 12:09:31 -0700)
fix some texts init UbitUmarov <ajlduarte at sapo dot pt> .../Shared/Tests/LSL_ApiAvatarTests.cs
minor text change (UbitUmarov) (Wed, 16 Oct 2019 07:47:55 -0700)
minor text change UbitUmarov <ajlduarte at sapo dot pt>
minor text change (UbitUmarov) (Wed, 16 Oct 2019 06:54:25 -0700)
minor text change UbitUmarov <ajlduarte at sapo dot pt>
minor text change (UbitUmarov) (Wed, 16 Oct 2019 06:45:04 -0700)
minor text change UbitUmarov <ajlduarte at sapo dot pt>

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