A suite of Monitoring Plugins (formerly known as nagios-plugins)
Self-hosted, lightweight server and website monitoring and O&M tool
Monitor temperature sensors, fan speed, voltage, load & clock speeds
Floating window used to display current network speed, CPU & memory
The Active Monitoring System
Disk Inspection and Monitoring
Turn WiFi signals into real-time human sensing and spatial awareness.
Open-source systems performance monitor
Scouter is open source APM (Application Performance Management) tool
Monitor temperature sensors, fan speeds, voltages, load & clock speeds
Open source monitoring system and time series database
Lightweight network IP scanner
Xray panel supporting multi-protocol multi-user expire day
The Network UPS Tools repository
An eye on your system
Cross-platform lib for process and system monitoring in Python
BGP and RPKI monitoring tool
A Vulkan and OpenGL overlay for monitoring FPS, temperatures, CPU/GPU
A Python based monitoring and tracking tool for Plex Media Server
Application Performance Monitoring System
Apache HertzBeat(incubating) is a real-time monitoring system
The open source, full-stack monitoring platform
Performance Co-Pilot
Community-based GPL-licensed network monitoring system
Visibility into servers, applications, and infrastructure