Zabbix - Track, record, alert and visualize performance and availability of IT resources
Zenoss Core - Zenoss (Zenoss Core) is an open source application, server and network management platform based on...
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
LANState - LANState - Network Mapper and Device Monitor
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
LogicMonitor - LogicMonitor is the SaaS performance monitoring platform for the world's best IT teams. Deploy Fast, Monitor More, Improve Ops.