Softaculous Web CalendarWebCalendar is a PHP-based calendar application that can be configured as a single-user calendar, a multi-user calendar for groups of users, or as an event calendar viewable by visitors.

WebCalendar can be setup in a variety of ways, such as...
* A schedule management system for a single person
* A schedule management system for a group of people, allowing one or more assistants to manage the calendar of another user
* An events schedule that anyone can view, allowing visitors to submit new events
* A calendar server that can be viewed with iCalendar-compliant calendar applications like Mozilla Sunbird, Apple iCal or GNOME Evolution or RSS-enabled applications like Firefox, Thunderbird, RSSOwl, FeedDemon, or BlogExpress.

Web Calendar is released under the GNU/GPL terms.  

Demo : 

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