ProxyFuzz is a man-in-the-middle non-deterministic network fuzzer written in Python. ProxyFuzz randomly changes (fuzzes) contents on the network traffic. It supports TCP and UDP protocols and can also be configured to fuzz only one side of the communication. ProxyFuzz is protocol agnostic so it can randomly fuzz any network communication.

The video shows ProxyFuzz proxying traffic between a VMWare Console and a VMWare Server. This is just a dumb example of the things you can do with this tool.

http://theartoffuzzing.com/demo4/

Download: http://theartoffuzzing.com/downloads/proxyfuzz/proxyfuzz.py

Windows Binary : http://theartoffuzzing.com/downloads/proxyfuzz/proxyfuzz.zip

Source: http://www.darknet.org.uk/