Wireshark 1.12.3 (Windows) (x64)

Wireshark is a network protocol analyzer licensed under the terms of the GNU GPL. It lets you capture and interactively browse the traffic running on a computer network. It has a rich and powerful feature set and is world's most popular tool of its kind. It runs on most computing platforms including Windows, OS X, Linux, and UNIX. Network professionals, security experts, developers, and educators around the world use it regularly.

Official site: https://www.wireshark.org/

For a changelog for 1.12.3, please visit https://wireshark.org/docs/relnotes/wireshark-1.12.3.html.