atoum : A simple, modern and intuitive unit testing framework for PHP!
PHP Quick Profiler : A tool for quickly profiling variables and resources used by PHP.
Mink : Mink is an open source acceptance test framework for web applications, written in PHP 5.3.
PHPMD - PHP Mess Detector : What PHPMD does is: It takes a given PHP source code base and look for several potential problems within that source. These problems can be things lik...