Watir is an automated test tool which uses the Ruby scripting language to drive the Internet Explorer web browser. Watir is a toolkit for automated tests to be developed and run against a web browser.

Srinath Anantharaju, a member of Google’s Security Team posted in Google’s Security Blog the availability of “Lemon” , a new web application security fuzzerdeveloped by Google.

PIRANA is a SMTP fuzzing and bruteforce exploitation framework that tests the security of a SMTP content filter. By means of a vulnerability database, the content filter to be tested will be bombarded by various emails containing a malicious payload intended to compromise the SMTP server

another web testing tool called FunkLoad. This python application can be used for functional and regression testing of web applications.