LibreNMS

/librenms

Community-based GPL-licensed network monitoring system

HertzBeat

/hertzbeat

Apache HertzBeat(incubating) is a real-time monitoring system with agentless, performance cluster, prometheus-compatible, custom monitoring and status page building capabilities.

Healthchecks

/healthchec

Open-source cron job and background task monitoring service, written in Python & Django

Cachet

/cachet

🚦 The open-source status page system.

Monocker

/monocker

Doku

/doku

💽 Doku - Docker disk usage dashboard

Beszel

/beszel

A lightweight server monitoring hub with historical data, docker stats, and alerts.

Glances

/glances

Glances an Eye on your system. A top/htop alternative for GNU/Linux, BSD, Mac OS and Windows operating systems.

Prometheus

/prometheus

The Prometheus monitoring system and time series database.

Change Detection

/changedete

The best and simplest free open source web page change detection, website watcher, restock monitor and notification service. Restock Monitor, change detection. Designed for simplicity - Simply monitor which websites had a text change for free. Free Open source web page change detection, Website defacement monitoring, Price change notification

Nagios

/nagioscore

Nagios Core

Netdata

/netdata

Architected for speed. Automated for easy. Monitoring and troubleshooting, transformed!

Uptime Kuma

/uptime-kum

A fancy self-hosted monitoring tool

Zabbix

/zabbix

Real-time monitoring of IT components and services, such as networks, servers, VMs, applications and the cloud.

Grafana

/grafana

The open and composable observability and data visualization platform. Visualize metrics, logs, and traces from multiple sources like Prometheus, Loki, Elasticsearch, InfluxDB, Postgres and many more.