SNMP MIB Browser for Linux platforms
A program for monitoring a DSL connection
A simple packet sniffer for local networks
Debugging tools for application-to-application communication.
Free Accountability Software
Web based management tool for unixes
A free SYSLOG Client
NetChecker checks & repairs internet connectivity problems
CIM Surveyor is a free Android mobile CIM discovery application.
C# Network Monitoring Software
Monitoring your infrastructure for free.
visual ping monitor in TNA(taskbar notification area)
Full Featured Windows Command Line Syslog Logger
KDE plasma applet to display network interface status