PHP Quick Profiler : A tool for quickly profiling variables and resources used by PHP.
Scrapy : Scrapy is a fast high-level screen scraping and web crawling framework, used to crawl websites and extract structured data from their pages. It can be...
Mink : Mink is an open source acceptance test framework for web applications, written in PHP 5.3.
atoum : A simple, modern and intuitive unit testing framework for PHP!
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 responses.