Cool VL Viewer 1.2Free
The Cool VL Viewer (formerly known as Cool SL Viewer) is a third-party viewer for Second Life and OpenSim grids. In the name, "VL" of course stands for virtual life.
This viewer also implements the RestrainedLove (formerly known as RestrainedLife) features. These features are disabled by default, so you won't notice any difference with a "normal" viewer till you enable them manually.