OWASP ZAP

OWASP ZAP screenshots

Penetration testing tool for finding vulnerabilities in web applications.
Main window
OWASP ZAP 1.3 : Main window

Alternative downloads

soapUI
5.4
FREE
Free and open source cross-platform Functional Testing solution.
GoLISMERO
FREE
Free software framework for security testing.
OTR Proxy
0.3.1
FREE
This is a localhost proxy you can use with almost any AIM client.