Open Source software (PHP) managing iCal (rfc2445) files, for non-calendar systems like CMS, project mgmt systems etc. able to manage calendar information like agendas, tasks, reports, totos, journaling data and communicate with calendar software.
Monket is an Ajax enabled online calendar. Drag and drop events to change dates, drag the start/end of an event to create multi-day events, create and edit events without refreshing the page, all with an iCal style interface.
Showlister is a PHP/MySQL web application designed to make it easy for bands (and other performers, speakers, etc.) to maintain their performance calendar. Admins can add, edit, and delete shows through a web interface.
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