Kubernetes is described as 'Open source orchestration system for Docker containers' and is a popular Virtualization tool in the network & admin category. There are more than 50 alternatives to Kubernetes, not only websites but also apps for a variety of platforms, including Linux, Windows, Mac and Self-Hosted apps. The best Kubernetes alternative is Heroku. It's not free, so if you're looking for a free alternative, you could try virt-manager or Vagrant. Other great sites and apps similar to Kubernetes are OpenShift, Rancher, Docker Swarm and Apache Mesos.