Somnium Space is creating an open, social, and persistent VR world on the Ethereum blockchain. Users can buy land on the open marketplace, build or import objects, and monetize their creations using a native in-world cryptocurrency called $CUBE. The map has a balance of water, nature, sounds, and its own day night cycle which parcels for sale and that people own are arranged around.
Somnium Space is free to download from Steam and works with most VR headsets. There's a drag and drop builder included for desktop users to make their own creations. The Unity SDK and Quest version is expected to launch sometime in late March or April.