Unai is both a VR headset and a virtual world designed specifically for it. The hardware and software are being built together to make spending time with people in VR feel the same as in real life.
Hubs is an immersive social experience that is delivered through the browser. You simply click on a web link to begin interacting with others inside virtual reality.
Vircadia is an open-source 3D interface and server solution that allows for vast social & educational environments to be created and lived in while also being shared in real-time with others.