Hippo OpenSim Viewer
The Hippo OpenSim Viewer is a modified Second Life viewer, targeted at OpenSim users. It allows building up to a height of 10,000 m, scaling prims up to 256x256x256 m and other exciting features. More specific OpenSim features are under development. For more details please refer to the features page or give it a try straight from the downloads page.
The current version is based on the official Linden Lab release 1.23.5. Additionally, it contains most patches from the Cool VL Viewer.