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)
Lightweight network IP scanner
BGP and RPKI monitoring tool
The Active Monitoring System
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
Open-source systems performance monitor
Network Enumeration Tool for Host Exploration and Recon
Floating window used to display current network speed, CPU & memory
Monitorix is a free, open source, lightweight system monitoring tool
A fancy self-hosted monitoring tool
High performance ping tool
The open source time series database
A Swiss army knife for your daily Linux network plumbing
Discourse Network Analyzer (DNA)
An eye on your system
Collect and display information and stats from a running PostgreSQL
A system monitoring tool that exposes system metrics
Monitor temperature sensors, fan speeds, voltages, load & clock speeds
Zeek is a powerful network analysis framework
Application to comfortably monitor your Internet traffic
A cross-platform desktop All-in-One assistant tool for Claude Code