Kubernetes is a 10-letter word stylized as K8s so something half as big as Kubernetes would be a 5-letter word stylized as K3s
K3s.io – is a highly available certified Kubernetes distribution designed for production workloads in unattended resource-constrained remote locations or inside IoT appliances and it is packaged as a single <40MB binary that reduces the dependencies and steps needed to install run and auto-update a production Kubernetes cluster
Photon OS – is a Linux based open source security-hardened enterprise grade appliance operating system that is purpose built for Cloud and Edge applications