Wireshark is the world's foremost network protocol analyzer, and is the de facto (and often de jure) standard across many industries and educational institutions.
Wireshark development thrives thanks to the contributions of networking experts across the globe. It is the continuation of a project that started in 1998.
This version fixes several problems with the 1.1.0 release, including an issue that kept Wireshark from running on many Windows machines.
Internet and communication
Windows, Linux, Mac
Product page: here