RealXtend
From OpenSimulator
RealXtend is a partnership company formed from ADMINO and LudoCraft, two Finnish companies. They have developed an improved version of the Second Life(tm) viewer which can be downloaded here. Information on how to connect the RealXtend viewer for ModRex (the interface between the viewer and opensim). The viewer for Windows is prebuilt. Here are instructions for running RealXtend in Wine if using Linux.