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Zabbix - Track, record, alert and visualize performance and availability of IT resources
Grafana - Data visualization & Monitoring with support for Graphite, InfluxDB, Prometheus, Elasticsearch and many more databases
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.
Netdata - Monitor your servers, containers, and applications, in high-resolution and in real-time.
Paessler PRTG - An advanced network monitoring solution to monitor network up/downtime, traffic and usage.
eZ Server Monitor - eZ Server Monitor is a script for monitoring Linux servers.