Snark v0.16 (02/18/05) -- HTTP Interrogation Proxy
A so called "attack proxy", Snark allows a user to monitor and edit HTTP requests and responses.  Snark can be configured to act as a web proxy, or in a tunnel mode which allows for proxy chaining, or use with other tools.  Snark was written in perl and should run in any environment that is supported by perl, and wxWindows.

source (old) -- win32 installer (new) -- discussion group