wdCalendar is a jquery based google calendar clone. It cover most google calendar features. User can choose to have a daily view, weekly view or monthly view. User can easily create, update or remove events by drag & drop. It is very simple to to integrate wdCalendar with a database.

wdCalendar is free (open source LGPL license), easy to use, and with great functionalities. You can check out the demo, and download it here.

Requirements: jQuery Framework
Demo: http://www.web-delicious.com/jquery-plugins-demo…
License: LGPL License