This Java servlet implements Web-based calendar. You can use it as a standard calendar system, for booking some resources etc. Calendar also supports WAP/WML so you can use it even from you mobile phone.

Web Based Calendar is one Java Servlet, used for an online calendaring system to schedule events. Includes calendar view, add event, modify event, list view. WBCalendar is written in Java, and uses Linux, Tomcat and MySQL for the database backend.

Connect Daily is a web-based calendaring system. It allows multiple users to add and edit calendar events using a web browser. The calendar display can then be directly integrated into your web site. It provides advanced capabilities for managing resources and facilities. Approval processes allow many users to edit calendars, with the assurance that all items added are approved. Support for downloading events into Microsoft Outlook and Palm PDAs is available. RSS 2.0 XML feeds are also supported.