Semantic versioning

https://semver.org/ A proposal to create some formalization around what the X.Y.Z terms mean in a version number and thus, make it clear as to which APIs are backwards compatible and which are not (APIs take in version number as an argument) 

Google Engineering Tools Blog

http://google-engtools.blogspot.com

Of particular interest to me was:
http://google-engtools.blogspot.com/2011/06/build-in-cloud-accessing-source-code.html