•MapServer – public domain version of ArcInfo
•GMT – text files as a GIS at some level
•UIRSA – public domain
•MapInfo – low end
•Strategic GIS
•ArcInfo/ArcGIS – ESRI
•EASy – “no analysis tools, just serving data”
•Delorme (ME); GeoZUI3D (UNH); JGOFS (!)
•Learning curve: lots of options, capabilities