WP MVC is a full-fledged MVC framework, similar to CakePHP and Rails, that developers can use inside of WordPress.
AngularJS for WordPress allows you to easily leverage the power of AngularJS and put it into your theme.
Includes extremely useful widgets for developers and users alike, and is a system written on a PHP 5 object oriented structure.
Easy integration of Zend Framework library into WordPress, making it available for themes and other plugins.
Tina MVC is a WordPress framework that allows you to develop plugins, shortcodes and and widgets.
Easy integration of CodeIgniter functionality into WordPress, making it available for themes and other plugins.
Provides a foundation and extensions for/to common WordPress developer functions/tasks - creating/installing plugins, complex database queries, etc