The Branch of Geospatial Support of the Bureau of Indian Affairs provides software, support, and training to federally recognized Tribes (employees or and contracted or compacted Tribal employees). 

To be eligible for these benefits, the organization must submit an application to participate in the Enterprise License Agreement (ELA) program. The products offered through this program are provided at no cost to ELA participants. Following receipt of the application, applicants can expect to receive a decision within 15 business days.

The software available includes ArcGIS Desktop, Pro, or Enterprise + additional add-on licenses (e.g., 3D Analyst, Spatial Analyst, Geostatistical Analyst, and Network Analyst); Portal for ArcGIS; ArcGIS Online; and ArcGIS Insights. 
With or without software downloaded, eligible Tribal entities can register for ESRI-led training online at no cost. These trainings range in experience from introductory courses for those getting started in GIS to managing geospatial data in ArcGIS. Registration for each course opens about one month prior to the course start date.