Activeworlds Browser 

Activeworlds offers Web veterans and newbies a whole new perspective on the Internet, and an introduction to the future of online communications, collaboration, and interactive entertainment. In Active Worlds you can stake a claim to a piece of land and build your own virtual home, meet people from all over the planet that can visit you in your home, explore other peoples virtual worlds, play online games, shop and much more. New homes, estates, castles, whole worlds and exciting features are being added all the time. Active Worlds doesn't just grow, it evolves!