A suite of Monitoring Plugins (formerly known as nagios-plugins)
Self-hosted, lightweight server and website monitoring and O&M tool
Monitor the stability of a Pandas or Spark dataframe
Floating window used to display current network speed, CPU & memory
Monitor temperature sensors, fan speed, voltage, load & clock speeds
The open source time series database
The Active Monitoring System
Open source monitoring system and time series database
Lightweight network IP scanner
BGP and RPKI monitoring tool
Apache HertzBeat(incubating) is a real-time monitoring system
Disk Inspection and Monitoring
An open source, real-time monitoring system with custom-monitoring
Free open source tool for real-time PC hardware sensor monitoring
360 monitoring agent
A fancy self-hosted monitoring tool
PostgreSQL metrics monitor/dashboard
Scouter is open source APM (Application Performance Management) tool
Simple. Scalable. Multi-cloud monitoring
An interactive NVIDIA-GPU process viewer and beyond
GRBL controller application with G-Code visualizer written in Qt
The Network UPS Tools repository
A distributed and high-performance monitoring system
pg_activity is a top like application for PostgreSQL server activity
The Open Source Security Platform