Unity - The multiplatform game creation tools for everyone.
VRChat - Create and play in virtual worlds with others
Godot Engine - Feature-packed 2D and 3D open source game engine.
Spatial - Collaborate from anywhere in AR
Blender - Blender is the open source, cross platform suite of tools for 3D creation.
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.