Bizcal is a component library for calendar widgets written in java using swing. It has components for day view, week view, month view, group view, etc.
CollectiveX is pioneering a new class of communications and social networking services designed explicitly for organized groups. It combines the best of group coordination and communication (a category currently occupied by Yahoo! Groups) with social netw
powerful and easy to use web-based calendar that runs on PHP and MySQL. A free version is available for use and is under constant development to improve its user interface and features.