A short introduction to VR:
http://www-vrl.umich.edu/intro/

VRAC C6:
http://www.vrac.iastate.edu/about/labs/c6/index.php

EVL at UIC:
http://evlweb.eecs.uic.edu/info/index.php3

OpenScenegraph:
http://www.openscenegraph.org

3D Theory:
http://www.neotek.com/3dtheory.htm

3DS Max:
http://www.discreet.com/3dsmax/

The Geowall Software:
http://geowall.geo.lsa.umich.edu/software.html

Home of the 3D Chat:
http://www.activeworlds.com/

VRML Virtual Reality Modeling Language:
http://www.w3.org/MarkUp/VRML/

Passive Stereo Viewing System:
http://ced.ncsu.edu/vise/current_initatives/3dstereo.html

VR in Education:
http://www.skally.net/eduvr/

VR Lab in Europe:
http://www.vrmedialab.dk/pr/index_e.html

VR Learning:
http://www.sunrisevr.com/vrlearn.htm

3-D Tours Featuring Park Geology:
http://3dparks.wr.usgs.gov/index.html

Anaglyph (3D) Imaging and Field Geology:
http://3dparks.wr.usgs.gov/3Dbayarea/html/aboutthissite.htm