O'Reilly - free "reports" (mini-books) I recently stumbled across this - one may want to check them out: http://www.oreilly.com/business/free/ http://www.oreilly.com/data/free/ http://www.oreilly.com/iot/free/ http://www.oreilly.com/programming/free/ http://www.oreilly.com/security/free/ http://www.oreilly.com/web-platform/free/ http://www.oreilly.com/webops-perf/free/