QGIS for ArcMap/ArcGIS
Geoserver for their REST based servers (ArcGIS Enterprise).
GRASS and GDAL do the leg work of much processing found in the spatial toolboxes and such.
However those tools do not have the polish that ESRI kit does, but at leas you’re not paying the licensing!
However those tools do not have the polish that ESRI kit does, but at leas you’re not paying the licensing!
- former ESRI consultant