Wireshark

Wireshark is a well-known company that specializes in network protocol analysis. Their flagship product, also named Wireshark, is a widely used network traffic analyzer. It is highly regarded by system administrators, IT professionals, and network analysts for its comprehensive features and functionality. Wireshark allows users to capture and examine network packets in great detail, making it an invaluable tool for troubleshooting, network monitoring, and developing software and communication protocols. The company is committed to open-source development, with the non-profit Wireshark Foundation supporting the continuous improvement of the tool. Wireshark's user base includes both commercial enterprises and non-profit organizations worldwide.

https://www.wireshark.org/