There is also opensim , the open source "second life server", and thousands of smaller grids . Also, highfidelity.io is aiming for a VR version of second life (

There is also opensim , the open source "second life server", and thousands of smaller grids . Also, highfidelity.io is aiming for a VR version of second life (like Sansar) but is still in development. Also, sinewave.space wants to make a modern second life.