It's important to note that some of the items in your list complement Kubernetes rather than replace it. Think of a cluster of VMs running CoreOS + Tectonic as

It's important to note that some of the items in your list complement Kubernetes rather than replace it. Think of a cluster of VMs running CoreOS + Tectonic as an alternative to Google Container Engine. Kismatic apparently calls itself "the Kubernetes Company." Disclaimer: I work on Google Cloud but not Kubernetes or GKE.