It's big and getting bigger, $100B+ / year depending on how granular or wide you want to cast the net.<p>Check out the Stripe Developer Coefficient report, that is telling from one vantage point. You might also consider https;/coss.media as a subsector. What about tools that help with digital transformation or cloud development?<p>I'm not sure there is a single report, you more have to hobble things together from various sources.