Multi-User Systems

Dive - An Internet-based distributed multi-user VR system, developed by researchers at the Swedish Institute of Computer Science since 1991.
http://www.sics.se/dive/

Planet Virtuel - 3D VR community with avatar based chat. Design and create your own home and surroundings.
http://www.planetvirtuel.com

Activeworlds - 3D virtual reality chat plugin software and servers. Design worlds, chat with friends, play games.
http://www.activeworlds.com/

3D-4u2 multi-user VR solutions - 3D-4u2 offers multiuser 3D and virtual reality technology on the internet that seemlessly integrates most current technologies, ranging from live video to 3D animations and allows users to build themselves.
http://www.3d-4u2.com/

VRSpace - An open source (gpl) virtual reality cross-platform 3D community software.
http://www.vrspace.org/

Contact Consortium - A research and trade association for virtual worlds, avatars, virtual community. Organizer of yearly Avatars conference.
http://www.ccon.org

AW Europe - An official distributor of Activeworlds technology in Europe with 3D environments for both business and home use.
http://www.aw-europe.com/

VRMLWorld.net - A portal to various VRML worlds, with multiuser chatting via VNet+. Free to use and to add your own worlds. Works best with IE and Blaxxun Contact.
http://vrmlworld.net/

Moove - 3D chat world. Customizable avatars with facial expression. Users can chat, build and furnish a house, listen to music, share files. Can be integrated with external tools.
http://www.moove.com/

Travelers Network - Travelers Network offers free voice chat in 3D virtual worlds.
http://travelersnetwork.net

Virtual Object System / Internet Virtual Reality - A software infrastructure for distributed object-oriented programming. The primary application for VOS is a multiuser virtual environment run by many interconnected clients.
http://interreality.org

Cybertown - A popular and long-running web-based multiuser world, using VRML and Blaxxun browser software. Chat, and use objects.
http://www.cybertown.com/

Unknown Galaxy - An Active Worlds based system where you can build structures, play games, or chat with friends. Also offers world hosting for a fee.
http://www.unknowngalaxy.com

3D Chat Virtual Universe - People can meet, interact with each other, build houses and whole worlds within a three-dimensional space.
http://www.3dchat.org

Chicago3D.Net - A hosting reseller for Activeworlds, Inc. since 1998.
http://chicago3d.net/aw1.html

The world of Ancient Mayas in virtual reality - 3D reconstruction of the Mayan Cities,using VRML or Adobe Atmosphere browser.
http://chichcalan.com/maya.html

Ziekerdanziek's 3D Help Guide - Resources for building and visiting online 3D communities.
http://vrml.alleyweb.co.uk

AtmoWire - Adobe Atmosphere tutorials, resources, directory, reviews, and news.
http://www.atmowire.com

DigitalSpace Corporation - Software and world development company. Also home to Traveler online community.
http://www.digitalspace.com/

Virtual Worlds Review - A guide to online virtual worlds with a focus on social interaction. Basic info, visitor ratings, reviews and helpful links for each program.
http://www.virtualworldsreview.com/

Alterlinks - Active Worlds resource for visiting or creating your own virtual world: hosting, textures, 3D objects, avatars, skyboxes, tutorials.
http://www.alterlinks.com