pfSense is an open source firewall/router computer software distribution based on FreeBSD.
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.
Syncthing is a free, open-source peer-to-peer file synchronization application. It can sync files between devices on a local network, or between remote devices over the Internet.
Proxmox Virtual Environment is an open-source server virtualization environment. It allows deployment and management of virtual machines and containers