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...
Mink : Mink is an open source acceptance test framework for web applications, written in PHP 5.3.
PHP_CodeSniffer : PHP_CodeSniffer tokenises PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.
The tweet-sized continuous integration app for PHP development.