Free, open source Computer Aided Dispatch for volunteer fire departments, ARES/RACES, CERT teams, EMS, search & rescue, and campus security. 30+ years of real-world use. Zero cost. Self-hosted.
YES Linux a distribution that is focused on ease of use, user experience, and the internet. In 3 screens a secure server is installed and administered from a browser. A user should not have to use the console, but can if they wish.