Bootkube
I have been trying out bootkube for a while now. It may be a beta, but I love the concept and how it works.
For those who have not heard about bootkube, its a tool which is used to bootstrap self-hosted clusters. Self-hosted essentially means running kubernetes as a objects on the kubernetes cluster ( I can hear people close their tabs ), its just kubernetes running on kubernetes. You can take a look at this video where Aaron Levy explains what self-hosted is and how you can benefit from it.
The one thing that you need to know is that bootkube is very opinionated on how the cluster should be. Bootkube is nothing but a tool to bootstrap your own self-hosted cluster.
bootkube helps me where i need it the most, upgrading clusters, i know upgrading to 1.6 is not going to be trivial, but i have done multiple upgrades 1.5.1 all the way to 1.5.4.