Hyperfy is a virtual world engine that lets you own, build and trade entire worlds in the metaverse. All worlds live on the Ethereum blockchain and can be freely traded on the open market.
An amazing, albeit rather undiscovered, gem of the "3D world" and "pocketverse" niches. Offers no-code environments for building little virtual worlds but also allows for REACT apps that make programming extra environmental responses very easy. We chose to do a soft launch in Hyperfy because it made calls to the Causality API so simple. Highly recommended as a space to demo tech such as ours. You can even go try our little world for yourself: https://hyperfy.io/causalit
The gold standard for 3D in the web has been Mozilla Hubs for a long time, but Hyperfy has some features like full-body VRM support and ethereum wallet integration that make it our choice for hangouts and events now.