Wireshark

Wireshark (64-bit)
FreeWireshark: Powerful Network Analysis Tool
Windows
Wireshark
FreeWireshark: The Industry Standard Network Analyzer
WindowsWireshark Network Protocol Analyzer
FreeWireshark: Powerful Network Analysis for Experts
Windows
WireShark for Linux
FreePerform thorough analysis of your network protocol.
Linux
Wireshark
FreePerform network protocol deep inspection and live capture.
Mac
Wireshark (64-bit) Development Release
FreePerform thorough analysis of your network protocol.
WindowsWireShark for Linux beta
FreePerform thorough analysis of your network protocol.
Linux
Wireshark U3 Development Release
FreeWireshark: The Ultimate Network Protocol Analyzer
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 U3
FreeWireshark: Powerful Network Analysis Tool
Windows
Wireshark Portable
FreeWireshark: The Industry Standard for Network Protocol Analysis
Windows