Flight Web Framework - An event-driven web framework, from Twitter

Laravel - A PHP Framework For Web Artisans

Phalcon - Web framework delivered as a C-extension for PHP

Fat-Free - PHP micro-framework designed to help you build dynamic and robust Web applications - fast

Lumen Framework - The stunningly fast micro-framework by Laravel.

Slim Framework - Slim is a PHP micro framework that helps you quickly write simple yet powerful web applications and APIs.