GatherinVR by Queppelin - GatherInVR is a platform for VR meetings and VR conferences and can be customized for any business or company.
VRChat - Create and play in virtual worlds with others
Spatial - Collaborate from anywhere in AR
Admix.in - Make money from your VR/AR content.
Second Life - Second Life is a virtual reality platform where individuals interact in a virtual world. The software was developed in 2003 by Linden Labs. More than one million people now regularly use the software.
Gather Town - Spatial video-chat worlds for work and play