Second Life

second life is a free 3d virtual world where users can socialize, connect and create using free voice and text chat. to access this world you need to use a viewer such as second life viewer (see second life viewer).

Freemium Mac OS X Windows Linux Web

ActiveWorlds

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!).

Free Mac OS X Windows Linux

OpenSimulator

OpenSimulator is an open source multi-platform, multi-user 3D application server. It can be used to create a virtual environment (or world) which can be accessed through...

Free Open Source Windows Linux

Smeet

Smeet is a virtual 3D World, where you can create your Avatar and your own Room. Start now and meet new friends, flirt, organize your party, share pictures and videos! Smeet is available in English, French, German, Italian and Spanish

Free Web

Avakin Life

Imagine a virtual world where you, the user, are an integral part of its evolution, where you can meet and interact with countless.. individuals who share similar...

Freemium Mac OS X Windows Android iPhone Android Tablet

VRChat

Join our growing community as you explore, play, and help craft the future of social VR. Create worlds and custom avatars. Welcome to VRChat.

Free Windows

WhiteCore-Sim

The WhiteCore server is an OpenSim/Aurora-Sim derived project with heavy emphasis on supporting all users, increased technology focus, heavy emphasis on working with...

Free Mac OS X Windows Linux