pfSense is an open source firewall/router computer software distribution based on FreeBSD.
openmediavault is the next generation network attached storage (NAS) solution based on Debian Linux.
Unraid is software for storing and managing digital files on a mass-storage server. It is an embedded Network Attached Storage (NAS) server operating system.
Proxmox Virtual Environment is an open-source server virtualization environment. It allows deployment and management of virtual machines and containers