Verse
The Verse 3D network protocol is already being developed as an open source project. Main developers currently are Eskil Steenberg and Emil Brink.
Verse Home Page - General information about Verse for developers.
Technical Specifications - Specifies the Verse platform.
Developers' Mailing List - Join this if you want to develop with Verse.
SVN - Includes access to WebSVN for online viewing of source code history.
Blender
Blender is the open 3D creation suite, currently fully developed within open source. Apart from hosting Verse related projects on blender.org, further development will be done on integrating Verse in Blender and research on utilizing Verse networking capabilities for a new architecture for Blender3.
http://www.blender.org/community/get-involved/
OpenSG
OpenSG is a portable scenegraph system to create realtime graphics programs, e.g. for virtual reality applications. It is developed following Open Source (LGPL) principles and can be used freely. It runs on IRIX, Windows and Linux and is based on OpenGL.
Using OpenSG technology, Fraunhofer IGD will provide a Verse rendering client, that can be used for high-end installations like H-eye-Wall or CAVE . Among other things OpenSG provides cluster support and subdivision surfaces. Furthermore a built in radiosity module will be developed for this client.