Open-Source Software
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Open-sourced software use to host applications.
Proxmox
Open-source hypervisor. I generally use this to house all other services.
Open Media Vault (OMV)
Favorite open source network attached storage (NAS) software. This can be run on something as small as a Raspberry Pi.
OPNsense
Open source firewall and routing software. This will transform any x86 based hardware with mutiple network interfaces into a po...
Pivpn
Simple vpn running in linux. Even though it was developed for the raspberry pi, I've successfully run this on Debian and Ubuntu.