Vircadia is described as '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' and is an app in the Social & Communications category. There are more than 10 alternatives to Vircadia for a variety of platforms, including Windows, Steam, Oculus Rift, Android and iPhone. The best alternative is Second Life, which is free. Other great apps like Vircadia are Mozilla Hubs (Free, Open Source), VRChat (Free), OpenSimulator (Free, Open Source) and Manyland (Free).
Imagine a world where anything is possible. Join a game of capture the flag in outer space. Share stories around a campfire while roasting marshmallows, then moments later experience a retro game of bowling with an alien and robot.
Welcome to Manyland, an open universe we invent and live together! In an infinite world of abundance, we create new things by drawing them, build new places, hang out and chat, collect, make music, party, script objects, go on adventures...
Choose an avatar to roam virtual maps reminiscent of classic video games. When you meet other people within that space an WebRTC video connection will be established. Larger gatherings possible with Jitsi Integration.
Activeworlds hosts a Universe of over 500 3D virtual reality worlds. In these worlds you can choose from a vast array of avatars that fit your personality (or your perceived personality - that's half the fun!).
In Facebook Horizon, not only can you explore the virtual world as it grows and changes, but you can discover all sorts of new things that interest and inspire you. Experience gravity defying, distance spanning, genre bending games of all types.