VeeR VR - Global VR video community
Firestorm Viewer - Firestorm is to Virtual Worlds what Firefox and Google Chrome is to the Internet. We develop and distribute an open source viewer for accessing Virtual Worlds.
VRChat - Create and play in virtual worlds with others
Catznip Second Life Viewer - Catznip is graphical client for Linden Lab's user created 3D virtual world, Second Life.
Spatial - Collaborate from anywhere in AR
Radegast - Display Homes And Buildings