A suite of Monitoring Plugins (formerly known as nagios-plugins)
Self-hosted, lightweight server and website monitoring and O&M tool
The open source post-building layer for agents
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 Active Monitoring System
Apache HertzBeat(incubating) is a real-time monitoring system
Lightweight network IP scanner
Disk Inspection and Monitoring
Sentry SDKs for JavaScript
Open source monitoring system and time series database
ChangeMonitor is an application for monitoring changes on websites
The open source time series database
BGP and RPKI monitoring tool
Scouter is open source APM (Application Performance Management) tool
Free open source tool for real-time PC hardware sensor monitoring
Cross-platform lib for process and system monitoring in Python
Blazing-fast system monitoring for your desktop
Visibility into servers, applications, and infrastructure
Xray panel supporting multi-protocol multi-user expire day
Open-source systems performance monitor
A simple server monitor tool
pg_activity is a top like application for PostgreSQL server activity
Monitor and troubleshoot transactions in complex distributed systems