Environmental Systems Research Institute (ESRI)

Environmental Systems Research Institute (ESRI) is an international supplier of GIS software, web GIS and geodtabase management applications. Most widely used software being ArcGIS.

The company is headquartered in Redlands, Califrornia. The company has 10 regional offices in the U.S. and a network of 80+ international distributors, with about a million users in 200 countries. The firm has 3,200 employees in the U.S., and is still privately held by the founders.