Self-hosted, lightweight server and website monitoring and O&M tool
The Network UPS Tools repository
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
Application to comfortably monitor your Internet traffic
Community-based GPL-licensed network monitoring system
Apache HertzBeat(incubating) is a real-time monitoring system
Open source monitoring system and time series database
Open-source systems performance monitor
A full packet capturing, indexing, and database system
A fancy self-hosted monitoring tool
A distributed and high-performance monitoring system
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
Free and Open Source network access control (NAC) solution
Monitorix is a free, open source, lightweight system monitoring tool