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 Network Packet Sniffing tool developed in Python 3
Lightweight network IP scanner
The Active Monitoring System
BGP and RPKI monitoring tool
Office Tool Plus localization projects
Monitor temperature sensors, fan speed, voltage, load & clock speeds
pg_activity is a top like application for PostgreSQL server activity
Bandwidth monitor and rate estimator
Open-source systems performance monitor
A fancy self-hosted monitoring tool
Floating window used to display current network speed, CPU & memory
A Swiss army knife for your daily Linux network plumbing
An eye on your system
High performance ping tool
Monitorix is a free, open source, lightweight system monitoring tool
Network Enumeration Tool for Host Exploration and Recon
Discourse Network Analyzer (DNA)
Zeek is a powerful network analysis framework
Collect and display information and stats from a running PostgreSQL
The open source time series database
A system monitoring tool that exposes system metrics
Apache HertzBeat(incubating) is a real-time monitoring system