An eye on your system
pg_activity is a top like application for PostgreSQL server activity
Lightweight network IP scanner
Enhanced Apache Server Status page - for one or multiple servers
FlowViewer is a web-based netflow data analysis tool.
Pinger alert
Xymon monitors your hosts, your network services, and everything else.
System monitoring dashboard for terminal
Fritz!Box SmartHome Monitoring with PRTG and AHA-Interface
A Network Packet Sniffing tool developed in Python 3
Monitor monthly internet Transmit and Receive bandwidth usage - Linux
Zenoss - Intelligent IT Operations Management
Tool to ping hosts through firewalls blocking ICMP
An application to track your PC in realtime
Network Ping time and UPS Logger
Real-time log monitoring in your browser
A modern graphical SSH client