network analyzer
Capsa Free - Colasoft LLC (Colasoft)
Capsa Free is a must-have freeware network analyzer and packet sniffer for Ethernet monitoring, troubleshooting and analysis. Capsa Free is a perfect choice for students, teachers and computer geeks to learn protocols and networking technology knowledge. The Capsa Free freeware application by Colasoft is one of the most popular free packet sniffer products available.