web application testing framework

[Serg Belokamen <serg.belokamen () gmail com>]

Hi All, 

   Does any one know or aware of any web application testing
frameworks? I would prefer something along the lines of Selenium
(http://selenium.thoughtworks.com/index.html) and open source.
Preferably usable from both Linux and Windows, one of the OS mentioned
would do as well, but both would be even better.

   Thanks,
      Serg