Extcalendar is a large Web-based calendar application. It allows you to browse the calendar by day, week, month, and category. It also includes a very extended administration area where you can add your events and categories and approve events submitted by others. The language of the calendar can be set to Dutch, English, French, German, Arabic, or Korean. The colors of the 'public' calendar can be configured. Several search options can be set, as well as one of several default views. Extcalendar is written in PHP, and it uses MySQL as a data storage backend.