Zenoss Core - Zenoss (Zenoss Core) is an open source application, server and network management platform based on...
Grafana - Data visualization & Monitoring with support for Graphite, InfluxDB, Prometheus, Elasticsearch and many more databases
LANState - LANState - Network Mapper and Device Monitor
Netdata - Monitor your servers, containers, and applications, in high-resolution and in real-time.
Nagios - Complete monitoring and alerting for servers, switches, applications, and services
eZ Server Monitor - eZ Server Monitor is a script for monitoring Linux servers.