Why is OMD the Best Open Source Monitoring Solution over Zabbix, Zenoss or Sensu I spend about 3 weeks vetting through 20+ open source monitoring solutions and at the end of the process, the choices had boiled down to few major ones - OMD (best combination of open source plug-ins put together for Nagios), Zabbix, Sensu, and Zenoss. The main components of OMD are Check_MK, PNP4Nagios, Nagvis, and o