... I send out a list of most interesting libraries and apps in the "PHP" section to about 1100 subscribers.
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A PHP framework for web artisans
File Upload widget with multiple file selection, drag&drop support, progress bar, validation and preview images, audio and video for jQuery. Supports cross-domain, chunked and resumable file uploads. Works with any server-side platform (Google App Engine, PHP, Python, Ruby on Rails, Java, etc.) that supports standard HTML form file uploads.
Faker is a PHP library that generates fake data for you
The Symfony PHP framework
Dependency Manager for PHP
SecLists is the security tester's companion. It's a collection of multiple types of lists used during security assessments, collected in one place. List types include usernames, passwords, URLs, sensitive data patterns, fuzzing payloads, web shells, and many more.
Guzzle, an extensible PHP HTTP client
sample code for several design patterns in PHP