A new version of Paros Proxy has been released.

"We wrote a program called "Paros" for people who need to evaluate the security of their web applications. It is free of charge and completely written in Java. Through Paros's proxy nature, all HTTP and HTTPS data between server and client, including cookies and form fields, can be intercepted and modified." - Paros Team

Download Link: http://www.parosproxy.org/download.shtml