5ced8212_World_Building_Tools__Tools_used_to_create_a_world
[Virtual world environment] Onlive Traveler [Tools used to design avatars] The Traveler Avatar Authoring Kit uses 3D Studio Max and you need a special design license to publish them. You have to be quite skillful at building Traveler avatars, which must be crafted by hand to coordinate with the voice/sip synching. [Tools used to create a world] 
Onlive Technologies can provide a space authoring building kit. Any program exporting VRML 2.0 can also be used to create worlds for Traveler.
World Building Tools
Tools used to create a world