atoum : A simple, modern and intuitive unit testing framework for PHP!
Mink : Mink is an open source acceptance test framework for web applications, written in PHP 5.3.
PsySH : A runtime developer console, interactive debugger and REPL for PHP. PsySH can be used as an interactive debugger, much like JavaScript's debugger sta...
Goutte : Goutte is a screen scraping and web crawling library for PHP.
Goutte provides a nice API to crawl websites and extract data from the HTML/XML response...
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...
A tool for quickly profiling variables and resources used by PHP.