Site Reliability Engineering - How Google Runs Production Systems - https://landing.google.com/sre/
BeyondCorp - a Zero Trust security framework modeled by Google - https://www.beyondcorp.com/
The Twelve-Factor App - a methodology for building software-as-a-service apps - https://12factor.net/
Free Programming Ebooks - http://www.oreilly.com/programming/free/