PingInfoView - PingInfoView is a small utility that allows you to easily ping multiple host names and IP addresses, and watch the result in one table.
Scapy - Scapy is a powerful interactive packet manipulation program.
SmokePing - Smokeping is a tool for measuring latency.
Winsock Packet Editor - WPE Pro is a packet editor.
PingPlotter - PingPlotter is a troubleshooting tool that helps IT professionals and neophytes identify, diagnose, and resolve network issues.
Nipper - Nipper - Neat Internet Protocol Packet EditoR - is a graphical packet generation tool.