LookingGlass Viewer 0.6Free
The LookingGlass Virtual World Viewer provides a modular framework for a client viewer of virtual world systems. LookingGlass is written in C# and licensed with a BSD license. The current version has a communication module that talks Linden Lab Legacy Protocol ("LLLP") which is compatible with Second Life(r) and OpenSimulator. A rendering modules exist for OpenGL (OpenTK) and the Ogre3D graphics engine. Other communication and rendering modules will be added in the future.
The state of development is alpha. It is no where near a point where a casual user can download and run and view a virtual world of their choice. The sources can be downloaded and built for the Windows XP and Windows 7 operating systems with Visual Studio. A binary installation package will soon be available.