Horde surely doesn’t top anyone’s list of best development frameworks but that doesn’t mean it isn’t useful in its own right. This is another PHP-based framework that provides you with many elements for quick web development, including authentication, compression, connection tracking, and MIME handling.

Horde is a free web-based groupware. ... This PHP-based framework provides all the elements required for rapid web application development. Horde offers applications such as the Horde IMP email client, a groupware package (calendar, notes, tasks, file manager), a wiki and a time and task tracking software.