Horde is a PHP-based Web application framework PHP is a popular open-source, reflective programming language used mainly for developing server-side applications and dynamic web content, and more recently, other software. ... A Web application framework is a set of software tools to make it easier to create Web applications. ...
It offers applications such as the Horde IMP email client, a groupware (calendar, notes, tasks, file manager), a wiki and a time and task tracking software. Horde IMP is a web-based mail user agent integrating with the Horde framework. ...