List of applications with iCalendar support

The following is a list of applications which support iCalendar:

Free software/Open source

• Balsa a lightweight email client for GNOME
• Chandler
• Citadel
• CiviCRM With its CiviEvent module
• Claws Mail (the vCalendar plugin is required to handle iCalendar in Claws Mail)
• Darwin Calendar Server
• DAViCal server for calendar sharing
• Dolibarr ERP & CRM for calendar module
• Drupal with its event module
• Evolution the Gnome email/calendar client
• Hall.com
• Hippo CMS
• Horde
• Joomla there are several plugins available
• Kontact (namely KOrganizer and KMail)
• Lightning (Mozilla extension for Thunderbird mail/news client and SeaMonkey internet application suite)
• Mozilla Thunderbird mail/news client (with Lightning extension)
• Moodle will export iCalendar data or let you subscribe to a Moodle iCalendar feed.
• Mulberry
• Org-mode - an Emacs mode for organising your life.
• OLAT - LMS supporting import and export of personal and shared calendars via iCalendar
• Open Atrium - Drupal based
• Opengroupware.org
• Open-Xchange
• Orage - part of the Xfce desktop, can import and export .ics files.
• ownCloud - cloud storage and services including WebDAV, CalDAV and CardDAV.
• Plone open source content management system
• Request Tracker - a ticket-tracking and call-center application. Exports iCalendar data.
• SeaMonkey internet application suite (with Lightning extension)
• Semantic Mediawiki semantic extension to MediaWiki
• Simple Groupware
• SOGo - an integrated groupware with Apple iCal, Mozilla Thunderbird support and native Outlook compatibility
• SPIP a CMS that allows the export of its site calendar in the iCalendar format.
• Tiki Wiki CMS Groupware Calendar exports to iCal and generates hcal
• Tryton
• Sunbird (a Mozilla stand-alone application, discontinued)
• TYPO3 via its Calendar Base Extension
• WebGUI
• Webical
• Web2project
• Wordpress via plugins
• Zarafa Collaboration Platform
• Zimbra Collaboration Suite
• Zotonic via mod_calendar

Proprietary (free to use or paid)

• 37signals Backpack
• Alfresco - a collaboration portal that allows export of site calendars in the iCalendar format.
• Atlassian Confluence
• Apple iCal
• Buni Meldware Communication Suite
• Contactizer
• Facebook
• FirstClass
• Google Calendar
• Huddle
• LiquidPlanner
• Lotus Notes
• Meeting Maker (PeopleCube)
• Microsoft Entourage
• Microsoft Exchange Server
• Microsoft Office Outlook 2000
• Microsoft Office Outlook 2007
• Microsoft Office Outlook 2010
• Microsoft Works Calendar
• MyPhoneExplorer FreeWare phone manager for SonyEricsson mobile phones.
• Novell Groupwise
• Nokia N9 Calendar
• Nokia N900 Calendar
• Nuvvo
• Projektron BCS
• Rainlendar
• Sun Java Calendar Server
• Teamwork agenda and meetings synchronizer
• Timecrunch.me - New calendar and personal events management web app. Will import .ics subscriptions and let you "peel" off events to republish. Free to all users.
• TrackerSuite.Net
• Westlaw (TWEN)
• Windows Calendar
• Windows Live Calendar
• WorkZone
• Wrike
• WebTrain - Web Conferencing Meeting Reminders
• Yahoo Calendar
• Yandex Calendar
• Zimbra Collaboration Suite