*[Software Architecture Patterns](http://www.oreilly.com/programming/free/software-architecture-patterns.csp)(email address *requested*, not required)
*[Software Engineering for Internet Applications](http://philip.greenspun.com/seia/)
*[Source Making Design Patterns and UML](https://sourcemaking.com/design_patterns)
*[Test Driven Development, Extensive Tutorial](https://github.com/grzesiek-galezowski/tdd-ebook) - Grzegorz Gałęzowski
*[The Site Reliability Workbook](https://landing.google.com/sre/workbook/toc/) - Betsy Beyer, Niall Richard Murphy, David K. Rensin, Kent Kawahara and Stephen Thorne
*[Web API Design](https://pages.apigee.com/rs/apigee/images/api-design-ebook-2012-03.pdf) - Brian Mulloy (PDF)
