Wireshark

Wireshark (64-bit)
FreeNetwork packet inspection
Windows
Wireshark Portable Development Release
FreeWireshark: Powerful Network Protocol Analysis Tool
Windows
Wireshark (32-bit) Development Release
FreeWireshark: The Premier Network Protocol Analyzer
Windows
Wireshark Portable
FreeWireshark: The Industry Standard for Network Protocol Analysis
Windows
Wireshark U3 Development Release
FreeWireshark: The Ultimate Network Protocol Analyzer
Windows
Wireshark
FreeComprehensive Network Protocol Analyzer
Mac
WireShark for Linux
FreeComprehensive Network Protocol Analyzer
LinuxWireShark for Linux beta
FreeComprehensive Network Protocol Analyzer
Linux
Wireshark (64-bit) Development Release
FreeComprehensive Network Analysis with Wireshark
WindowsWireshark Network Protocol Analyzer
FreeWireshark: Powerful Network Analysis for Experts
Windows
Wireshark U3
FreeWireshark: Powerful Network Analysis Tool
Windows
Wireshark
Free32-bit packet analysis
Windows