Words and Wires has used Open Source software extensively since the mid-nineties. We've built and run all sorts of servers over the years, using different Linux distributions. The virtualisation technology used by Words and Wires runs under the Proxmox Virtual Environment, and is based on KVM for the virtual machines, running Debian Linux for the underlying physical host operating system. The virtual machine servers Words and Wires provides run Ubuntu Linux, the most recent Long Term Support (LTS) server release. The entire software stack is entirely Open Source, so that your virtual servers can be copied, cloned, and migrated from one physical host to another with no license cost issues.
What is Open Source Software?