VRChat - Create and play in virtual worlds with others
Google ARCore - Google Augmented Reality SDK
Spatial - Collaborate from anywhere in AR
8th Wall - Cross-Platform Mobile AR
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.
Wikitude SDK - Wikitude’s all-in-one AR SDK combines 3D tracking technology (SLAM), image recognition and tracking, as well as geo-location for apps.