3 best opensim and second life viewers in my opinion are these:
6 http://wiki.kokuaviewer.org/wiki/Kokua/Downloads
7 favorite 3d viewer for a while.
10 http://www.firestormviewer.org/downloads/
11 good standard 3d viewer.
14 https://radegast.life/downloads/
15 good simple viewer as a remote control, not great for 3d interactive.