= !NetTool - Web & Network Debugging Tool
 ''!NetTool is a developer tool for debugging and testing networked applications, with a specific emphasis on webapps and web services (i.e. HTTP-based applications).''

[http://neilja.net/nettool/index.html NetTool] is a nice debugging proxy, written in Java. Particularly useful is the ''TCP tunnel'' mode, which allow one to see exactly what is exchanged between the web browser and the server.