The following is a list of applications which support iCalendar :
Open Source
- Chandler
- Citadel
- Claws Mail (vCalendar plugin is required to handle iCalendar in Claws Mail)
- Darwin Calendar Server
- DAViCal CalDAV Server
- Drupal with its event module
- Evolution the Gnome email/calendar client
- Horde
- Kontact (namely KOrganizer and KMail)
- Lightning (a Mozilla extension for Thunderbird)
- Moodle will export iCalendar data or let you subscribe to a Moodle iCalendar feed.
- Mulberry
- OLAT - LMS supporting import and export of personal and shared calendars via iCal
- OpenCRX
- Opengroupware.org
- Opengoo
- Open-Xchange
- PHP iCalendar web based display of shared calendars
- Plone open source content management system
- Semantic Mediawiki semantic extension to MediaWiki
- Simple Groupware
- SPIP a CMS that allows the export of its site calendar in the iCal format.
- Tryton
- Sunbird (a Mozilla stand-alone application)
- TYPO3 via its Calendar Base Extension
- WebCalendar
- WebGUI
- Webical
- ZapCalendar a Joomla based calendar component with iCal support
- Zimbra Collaboration Suite
Proprietary
- 37signals Backpack
- Airset
- Atlassian Confluence
- Apple iCal
- Bookwhen - Calendar based booking
- Clio
- Contactizer
- Buni Meldware Communication Suite
- EssentialPIM (There is a freeware and a commercial version available)
- Famundo
- FirstClass
- Flightmap
- Google Calendar
- Intoweb Calendar
- Jalios JCMS
- Joint Contact
- Joyent Connector
- Kickstart
- Lotus Notes
- Microsoft Entourage
- Microsoft Exchange Server
- Microsoft Office Outlook 2007
- Microsoft Works Calendar
- Novell GroupWise 8.x
- Novell Teaming
- Nuvvo
- Planyo online reservation system
- Rainlendar
- Sun Java Calendar Server
- Teamwork agenda and meetings synchronizer
- Westlaw (TWEN)
- Windows Calendar
- Windows Live Calendar
- WorkWeek 2 Personal Organizer
- Wrike
- WebTrain - Web Conferencing Meeting Reminders
- WinCalendar for Windows, Word &
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