Download

Stable Releases
These are the last version that were considered "stable" and useable in a test enviornment.

Version 0.4.0 (Source) http://dist.opensimulator.org/opensim-0.4.zip (Source) http://dist.opensimulator.org/opensim-0.4.tar.gz

Nightly Builds
These are compiled packages created daily from the svn repository. They can be downloaded for windows from: http://ruth.petitbe.be/build/

SVN Checkout
To get the very latest (and usually unstable) source, run:

svn co http://opensimulator.org/svn/opensim/trunk opensim

SVN can be downloaded for Windows from here, or for Mac OS X here.