Check out the REGIS site at the University of California, Berkeley, where BAGIS development will begin. Specifically, note GRASSLINKS, a WWW-accessible version of GRASS.
Reportedly the first WWW-based GIS is NAISMAP, developed by the National Atlas Information Service of Geomatics Canada.
Read the paper On-Line Environmental GIS by Anthony P. Steinke & David G. Green of Charles Sturt University, and David J. Peters of the Tasmanian Parks and Wildlife Service, Australia
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