1)   EtherSnoop 1.10
EtherSnoop light is a free network sniffer, designed for capturing and analysis of the packets going through the network.

 2)   HTTProbe 1.0
HTTProbe is a powerful HTTP sniffer and analyser written in Java which allows you to read HTTP headers, log them and resend directly a HTTP request sent from your browser to a web server after having optionally modify the HTTP request's header.