Chat with other users, race motorcycles against them, or build in your own personal world.
KingdomVR is almost completely open-source (forked from Substrata), check out the source code on GitHub here.
You can enter KingdomVR in your browser. Alternatively, explore Substrata with the faster native client by downloading it below.
Windows - Download the official KingdomVR Launcher for Windows
MacOS - Download the official Kingdom VR Launcher for MacOS, and then extract it and move the .app into your ~/Applications folder. (not /Applications, it shouldn't ask you for an admin password)
Linux - Download the Substrata client from here.