The Metaverse is a new convergence layer for the Internet, replacing the concept of apps with a world you go to. All your data will be there, controlled by code, and you will directly manipulate it with tools. You can invite anyone to join you.
Peer-to-peer protocols, free and open source software, and in world, things in your hand to get something done.
Developing the core "minimum viable product" (demo) over at max.tunes.org. It currently supports entering text in 3-d space, flying around, and interacting with simulated objects.