Twillip is a project mainly written in PHP, based on the MIT license.
A Handy Way To Develop PHP For Twilio
Twillip is a development kit for Twilio with PHP. It helps you develop easier and faster.
http://www.velvetcache.org/2010/09/16/developing-for-twilio-in-php-introducing-twillip/
Twillip is MIT Licensed. Enjoy.