These are apps that allow you to perform all main geospatial tasks (collect, organise, analyse and disseminate geospatial data).

• ArcGIS pro
  A commercial general-purpose geospatial desktop app.
• ArcGIS Online
  An online cousin to ArcGIS pro with data some data analysis and creation options. A key use of ArcGIS online is to create web maps and make data sources available online. The ArcGIS Online ecosystem also contains more specialised apps such as StoryMap and Field Maps.
• QGIS
  An open-source general-purpose geospatial desktop app much like ArcGIS pro. QGIS has an extensive set of plugins that can add new functionality to QGIS