Self-hosted, lightweight server and website monitoring and O&M tool
The Network UPS Tools repository
A suite of Monitoring Plugins (formerly known as nagios-plugins)
The Active Monitoring System
Lightweight network IP scanner
Monitor temperature sensors, fan speed, voltage, load & clock speeds
A utility to safely generate malicious network traffic patterns
BGP and RPKI monitoring tool
Apache HertzBeat(incubating) is a real-time monitoring system
Application to comfortably monitor your Internet traffic
Community-based GPL-licensed network monitoring system
Open source monitoring system and time series database
Open-source systems performance monitor
A full packet capturing, indexing, and database system
A distributed and high-performance monitoring system
A fancy self-hosted monitoring tool
An eye on your system
Performance Co-Pilot
Zeek is a powerful network analysis framework
A Swiss army knife for your daily Linux network plumbing
pg_activity is a top like application for PostgreSQL server activity
Monitor and troubleshoot transactions in complex distributed systems
The core of our monitoring platform
Application Performance Monitoring System
Cross-platform lib for process and system monitoring in Python