... I send out a list of most interesting libraries and apps in the "PHP" section to about 1100 subscribers.
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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.
The Doctrine Event Manager is a library that provides a simple event system.
A PHP framework for web artisans
Promises/A+ library for PHP with synchronous support
PHP 5.x support for random_bytes() and random_int()