Umbraco is a fantastic open source project, as well as a great example of how open source can support a profitable company as well, through support, training, and certification programs.
I don't use it as much these days, as its not part of my day job, and for my hobby projects I'm using static site generators, I appreciate what Umbraco has, and how they do it. It really is great software, for users and developers.
God, I hope so.