Multi-User Systems

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

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

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

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

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

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

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

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

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/

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/

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/

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

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

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

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

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/

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/

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

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