Largo - The WordPress Framework for News Websites. A project of the Institute for Nonprofit News.
Home - Pods Framework
HTML5 Boilerplate: The web’s most popular front-end template
Foundation | The Most Advanced Responsive Front-end Framework from ZURB
Material Design Lite
PageLines | A Drag and Drop Theme Design Platform for WordPress
Hobo - the web application builder for Rails
20 Wordpress Theme Frameworks And Starting Resources
Top 10 Free WordPress Frameworks for Designers | Most Inspired: Design Inspiration Blog