Google Groups - Google Groups allows you to create and participate in online forums and email-based groups with a rich experience for community conversations.
VRChat - Create and play in virtual worlds with others
DownToMeet - DownToMeet is a platform to organize, find, and attend group events.
Spatial - Collaborate from anywhere in AR
Mighty Networks - Mighty Networks enables entrepreneurs, organizations, and companies to create and grow a community-powered brand.
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.