I found interesting solution for UI testing, it is iMacros.
But on my site I have captcha when a new user sign in. There is two options to test sign in page is disable captcha for testing time or solve it by some automatic way.
There is exits services that give you ability soleve captcha automatically by iMacros. But all the services is not for free.
I found Captcha Trader the service provide solving captcha by credits that you able to buy or earn by solving other captchas.