Purpose-built OS for Kubernetes, fully managed by Kubernetes.
k3OS is a Linux distribution designed to remove as much OS maintenance as possible in a Kubernetes cluster. It is specifically designed to only have what is needed to run k3s. Additionally the OS is designed to be managed by kubectl once a cluster is bootstrapped. Nodes only need to join a cluster and then all aspects of the OS can be managed from Kubernetes. Both k3OS and k3s upgrades are handled by the k3OS operator.

Use a Raspberry Pi, old computer or VM as network storage for different retro computers and consoles.
RetroNAS is a tool that installs other tools, and is a rolling release. Each time the command line "retronas" tool is run, the core project is updated to its latest stable release. Third party tools that RetroNAS installs are done so via a mix of Debian APT repositories (which can be managed via standard package manager and system update tools), and for specialised tools via upstream project pages (these can be updated by re-running the tool installer).

Proxmox Virtual Environment is an open source server virtualization management solution based on QEMU/KVM and LXC. You can manage virtual machines, containers, highly available clusters, storage and networks with an integrated, easy-to-use web interface or via CLI. Proxmox VE code is licensed under the GNU Affero General Public License, version 3. The project is developed and maintained by Proxmox Server Solutions GmbH.