Catznip Second Life Viewer - Catznip is graphical client for Linden Lab's user created 3D virtual world, Second Life.
Second Life - Second Life is a virtual reality platform where individuals interact in a virtual world. The software was developed in 2003 by Linden Labs. More than one million people now regularly use the software.
Firestorm Viewer - Firestorm is to Virtual Worlds what Firefox and Google Chrome is to the Internet. We develop and distribute an open source viewer for accessing Virtual Worlds.
The Legend of Pirates Online - Pirates of the Caribbean Online is an Action MMORPG, Exploration, Virtual-World, and Exploration Simulation developed and published by Disney Online.
Second Life Viewer - Download Second Life from the official site here.
ActiveWorlds - Activeworlds hosts a Universe of over 500 3D virtual reality worlds.