When it comes to education, OpenSim has four main advantages:
1. Privacy. The world can be run entirely behind a firewall, or outside the firewall, but for registered users only. Running a world behind a firewall adds another advantage…"
"If you're looking for a world with lots of casual users, then Second Life is still it. (Unless you go into the gaming-oriented worlds like World of Warcraft.)
OpenSim is a completely separate platform, built from scratch. However, it is…"