Nagios, now known as Nagios Core, is a free and open source computer-software
application that monitors systems, networks and infrastructure. Nagios offers
monitoring and alerting services for servers, switches, applications and
services. It alerts users when things go wrong and alerts them a second time
when the problem has been resolved.
Source:
https://en.wikipedia.org/wiki/Nagios
How to install nagios on Ubuntu:
https://help.ubuntu.com/lts/serverguide/nagios.html.en
Be aware that only the "Nagios Core" products are open source:
https://www.nagios.org/
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