ActiveWorlds is described as '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!)'. There are more than 10 games similar to ActiveWorlds for a variety of platforms, including Windows, Online / Web-based, Android, Mac and Oculus Rift. The best alternative is Second Life, which is free. Other ActiveWorlds like games are VRChat (Free), OpenSimulator (Free, Open Source), Tower Unite (Paid) and IMVU (Freemium).
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.
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.
AltspaceVR is a social VR platform for meeting people from around the world, playing interactive games, and attending free live events. Choose from over 28 activities or attend live events with comedians, DJs, authors, celebrities, and more.