WATOBO is intended to enable security professionals to perform highly efficient (semi-automated ) web application security audits.

Features

WATOBO has Session Management capabilities! You can define login scripts as well as logout signatures. So you don’t have to login manually each time you get logged out.
WATOB can act as an transparent proxy
WATOBO has anti-CSRF features
WATOBO can perform vulnerability checks out of the box.
WATOBO supports Inline De-/Encoding, so you don’t have to copy strings to a transcoder and back again. Just do it inside the request/response window with a simple mouse click.
WATOBO has smart filter functions, so you can find and navigate to the most interesting parts of the application easily.
WATOBO is written in (FX)Ruby and enables you to easiely define your own checks
WATOBO is free software

download:

http://sourceforge.net/projects/watobo/