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.
VRChat - Create and play in virtual worlds with others
Habbo - Hobbo is also known as ‘Hobbo Hotel’.
Vircadia - Vircadia is an open-source and decentralized real-time VR creation platform for university, enterprise, social, and OpenSim users.
IMVU - IMVU is multiplayer online video game created by ‘IMVU Inc’.
Facebook Horizon - Explore, play, and create in Facebook's ever-expanding VR world.