WinPCap 

WinPcap is a port of the Unix libpcap (packet capture) library, which in turn is build on BPF (Berkeley Packet Filter). WinPcap consists of wpcap.dll, which implements the high-level functions, and packet.dll, which is the kernel-mode driver.

Snort (www.snort.org) and Ethereal (www.ethereal.com) both use WinPcap.

WinPCap by ShadowLurker July 17, 2003

WinPCap 

A piece of shit program that is capable of bringing down all network traffic when run under Windows XP

Damn, this generic program is nearly as bad as WinPCap

WinPCap by All Windows XP users March 13, 2003