Samuel Song is responsible for the National Cemetery GIS implementation within Veterans Affairs and like many in government increased use of GIS means a greater sensitivity to cost. Samuel decided to investigate migrating to an open source geospatial from a commercial stack and found it surprisingly easy though there were some challenges. Samuel outlined his experience at this year's GIS in the Rockies conference in Denver.
He is recommending as a first step migrating off ArcGIS Desktop to QGIS. That alone will save him $7200/annum. In the future he is looking at PostgreSQL/PostGIS replacing SQL Server, using OpenLayers for his Web GIS and testing QField mobile data collector to replace Collector for ArcGIS.
His overall conclusion is that although some GIS professionals fear a transition to an open source stack due to its perceived complexity and many moving parts, he found that it is possible to move to a fully open source platform from an existing ArcGIS implementation and that some parts of the migration are much simpler than he expected.