packet sniffer

It allows to check whether the target machine recieve the packet.

Network Sniffer is a Windows based Packet sniffer an Network analyzer

Packet Player is a replay tool for open and playback packet trace file.

Packet Builder is useful tool used for creating custom network packets.

Winsock Packet Editor (WPE) Pro is a packet sniffing / editing tool

Send a magic packet to turn computers on remotely.

Universal FTP Password Sniffer & Recovery Tool

HTTP Sniffer and Analyzer

Free HTTP Sniffer can monitor HTTP traffic in real-time to find the URLs.

It is a native Mac OS X implementation of a network protocol analyzer.