"A light-weight cross browser javascript microformats 2 parser
which can also be used in browser extensions."
Created by Glenn Jones and released under the MIT License.
A free (libre), open-source (GNU GPL), content management platform designed for group collaboration. Open Atrium is based on Drupal (running on Apache, with a MySQL database).
A MIT-licensed template for HTML5 websites that includes a lot of CSS and JS tweaks and optimizations. It provides support for JQuery, Google Analytics, old browsers, etc.
A free (libre), open-source (GNU GPL) blogging and content-management system. WordPress is written in PHP, supports severeal operating-systems, and requires a MySQL database.
Notable WordPress sites include the U.S. Library of Congress, MSNBC, and The Rolling Stones.
A free (libre), open-source (GNU GPL) content management framework written in PHP with support for a number of operating-systems, web-servers and databases.
Drupal made international news following the U.S. White House's October 2009 web redesign. The variety of Drupal-powered websites demonstrates the platform's flexibility. Notable examples include British Medical Journal (BMJ); Stanford Law School, and Turner Broadcasting.
Omeka is a free, flexible, and open source web-publishing platform for the display of library, museum, archives, and scholarly collections and exhibitions. Its five-minute setup makes launching an online archive or exhibition as easy as launching a blog.