@marc0der talk at GR8Conf US is a great introduction to GVM. You will learn how is built, why and where it is headed to (SDKman). Check out the GVM Talk slides
Embarrassing, I did not discover GVM until Greach Conference 2015. I used to have multiple grails folders under my Applications folder in OS X. :-( Of course, now it is GVM everywhere.
If you are not yet using GVM, please watch this video.
It is always great to discover how others build software. I discovered drone.io thanks to this talk too.