best opensim and second life viewers in my opinion are these:

kokua
http://wiki.kokuaviewer.org/wiki/Kokua/Downloads
favorite 3d viewer for a while.

phoenix firestorm
http://www.firestormviewer.org/downloads/
good standard 3d viewer.

radegast
https://radegast.life/downloads/
good simple viewer as a remote control, not great for 3d interactive.