GRASS for DebianScience. See also EduGRASS.
powerful analytical capabilities
generally considered user-unfriendly. This has improved some with the 6.0 release, but you will still find it has a steep learning curve.
Is it compatible with ArcView?
Yes, GRASS can import ESRI shapefiles (common ArcView format) with r.in.gdal.
DebianScienceGRASS (last modified 2009-03-16 03:37:07)