Проекты реализованные на PHP

Эмуляторы веб браузера

https://github.com/Behat/Mink

Пакетный менеджер

https://getcomposer.org/

Non-blocking PHP crawler

https://github.com/maikelvanmaurik/schrapert

https://github.com/mvdbos/php-spider

https://github.com/stil/curl-easy

https://github.com/hedii/php-crawler

https://github.com/jae-jae/QueryList

https://github.com/hightman/pspider

https://github.com/antonmedv/homer