pg_activity is a top like application for PostgreSQL server activity
Python library and shell utilities to monitor filesystem events
Collect and display information and stats from a running PostgreSQL
Open Source Monitoring System for performance and availability.
Manage and interpret IPMI systems with common a software tool
Powerful, open-source network protocol analyzer
Performance Data collector for Monitoring.
Network Enumeration Tool for Host Exploration and Recon
Produces a graphical map of hosts, switches and routers in a network.
This is now also available here github.com/sharkcz/collectl.git
Fritz!Box SmartHome Monitoring with PRTG and AHA-Interface
Monitoring, visualization and management for Docker and Kubernetes
Monitor monthly internet Transmit and Receive bandwidth usage - Linux
repair corrupted pcap and pcapng files
Xplico is a Network Forensic Analysis Tool (NFAT)