Open-source systems performance monitor
Self-hosted, lightweight server and website monitoring and O&M tool
pg_activity is a top like application for PostgreSQL server activity
An eye on your system
SQL operating system instrumentation and monitoring framework
Light-weight system monitor for X
Zeek is a powerful network analysis framework
Monitorix is a free, open source, lightweight system monitoring tool
Manage and interpret IPMI systems with common a software tool
This is now also available here github.com/sharkcz/collectl.git
repair corrupted pcap and pcapng files
A modern graphical SSH client
LumoGate is a Windows Wifi Hotspot Management Software
Real time monitoring for embedded devices
Free Syslog Server for Windows with a graphical user interface
Software, Server and Application Monitor
Tkined/Scotty is a graphical network monitoring package
Library for reading nfdump files
Daemonlogger is a packet logger and soft tap developed by Martin Roes
Monitoring your infrastructure for free.