This is the definitive source of PEAR's core files.
The Windows installer for the Composer PHP Dependency Manager
This script will allow users of your site and you can easily download any video from YouTube. It is possible to download video of different quality (from mp4 to 3gp). It is also possible to download an audio track from YouTube video. The script is very simple to install, it is not very resource intensive. The script supports all legacy (and not very) versions of php.
Extension exposing PHP 7 abstract syntax tree
HTML to PDF converter for PHP
Guzzle, an extensible PHP HTTP client
PHP library for the Stripe API.
Script that will download and prep a WordPress install for you.