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)
A utility to safely generate malicious network traffic patterns
Floating window used to display current network speed, CPU & memory
The Active Monitoring System
Monitoring Tool for your IT Environment
Monitor temperature sensors, fan speed, voltage, load & clock speeds
Lightweight network IP scanner
Community-based GPL-licensed network monitoring system
Open-source systems performance monitor
An eye on your system
BGP and RPKI monitoring tool
Apache HertzBeat(incubating) is a real-time monitoring system
pg_activity is a top like application for PostgreSQL server activity
Open source monitoring system and time series database
A full packet capturing, indexing, and database system
An open source, real-time monitoring system with custom-monitoring
The core of our monitoring platform
A distributed and high-performance monitoring system
Zeek is a powerful network analysis framework
A simple program to monitor your network/data usage
SQL operating system instrumentation and monitoring framework
Application to comfortably monitor your Internet traffic
Database connection pool written in Java