Ethereal

Ethereal screenshots

Sniffer application used to monitor network traffic, filtering by protocol
Wireshark's capture options
Ethereal : Wireshark's capture options

Alternative downloads

Colasoft Capsa Free
It's a powerful and feature-rich network analysis app.
9.0.0.9034
FREE
EffeTech HTTP Sniffer
HTTP packet sniffer and protocol analyzer.
4.1
Colasoft Packet Player
Packet replayer for Windows.
1.3.1.235
FREE