Energy (namely Oil and Gas production) contracts are huge in B2B GIS and offer the growth opportunities that execs love, but in my own opinion the most consistently profitable sector and also the one ripest for disruption is local and state governments in the USA.

Imagine being a cash strapped county and paying 6 figures for a software license to a REST API and then having to become a tiny dev shop just to start delivering your generic pothole reporting app to web users.