ArcInfo - Complete Desktop GIS for the GIS Professional ArcGIS Engine - Create Custom GIS Desktop Applications
ArcEditor - Desktop GIS with Advanced Geographic Data Editing and Management ArcGIS Explorer - Geographic Intelligence Served on Demand
ArcView - Desktop GIS for Mapping, Data Integration, and Analysis ArcReader - ArcGIS Desktop Viewer
Desktop Extensions - Extensions for ArcInfo, ArcEditor, and ArcView