Self-hosted, lightweight server and website monitoring and O&M tool
The Network UPS Tools repository
A utility to safely generate malicious network traffic patterns
Lightweight network IP scanner
The Active Monitoring System
Monitor temperature sensors, fan speed, voltage, load & clock speeds
Monitoring Tool for your IT Environment
Apache HertzBeat(incubating) is a real-time monitoring system
BGP and RPKI monitoring tool
A full packet capturing, indexing, and database system
Open-source systems performance monitor
Open source monitoring system and time series database
Community-based GPL-licensed network monitoring system
A distributed and high-performance monitoring system
Application to comfortably monitor your Internet traffic
Monitor and troubleshoot transactions in complex distributed systems
pg_activity is a top like application for PostgreSQL server activity
An eye on your system
A fancy self-hosted monitoring tool
Performance Co-Pilot
A simple program to monitor your network/data usage
Monitorix is a free, open source, lightweight system monitoring tool
SQL operating system instrumentation and monitoring framework
A Swiss army knife for your daily Linux network plumbing
Free and Open Source network access control (NAC) solution