Horde is both an Open Source software project and an application framework written in PHP.
The application framework is currently the basis for 50 applications written by developers from around the world, including the flagship IMP Webmail client, the popular Chora repository viewer, and a complete groupware suite. The guiding principles of the Horde Project are to create solid standard-based applications using intelligent object oriented design, and wide-ranging platform and backend support. There is great emphasis on making Horde as friendly to non-English speakers as possible. The Horde Framework currently supports many localization features such as unicode and right-to-left text, and is shipped with translations in over 40 languages.