OpenSource Projects Involvement
Composer/Packagist - PHP Dependency Manager
Symfony2 - PHP Web Framework and component library
Monolog - Logger for PHP
PHP Console - A tiny PHP testbed for trying snippets quickly in your browser
Slippy - HTML/JS Presentation Tool
You can also check out my GitHub repositories and my ohloh profile for all the little details, and perhaps more up to date information than what you find here.