Nagios vs ServiceNow

Nagios, an open-source computer-software application, 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. Ethan Galstad and a group of developers originally wrote Nagios as NetSaint. As of 2015 "Agios" also transliterates the Greek word, which means "saint".

ServiceNow is a platform-as-a-service provider of enterprise Service Management software. It was founded in 2003 by Fred Luddy, the previous CTO of Peregrine Systems and Remedy Corporation. ServiceNow specializes in delivering ITSM applications and thus competes with BMC, Computer Associates, IBM, and Hewlett-Packard. It also provides a platform for forms-based workflow application development and thus competes with SaaS/PaaS providers such as Salesforce.com's Force.com offering. Slootman has specifically indicated this as a key corporate strategy in press interviews and keynotes at the ServiceNow user conferences called Knowledge.