What are some alternatives?
When comparing NetXMS and System Center Operations Manager, you can also consider the following products
Zabbix - Track, record, alert and visualize performance and availability of IT resources
LogicMonitor - LogicMonitor is the SaaS performance monitoring platform for the world's best IT teams. Deploy Fast, Monitor More, Improve Ops.
Opsview Atom - Monitor everything. Integrate anything. Scale anywhere.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
Splunk Enterprise - Splunk Enteprise is the fastest way to aggregate, analyze and get answers from your machine data with the help machine learning and real-time visibility.
OpenNMS - Project home page of OpenNMS - a java based network managememnt platform developed under the Open Source model