iCal is a personal calendar application made by Apple Inc. that runs on the macOS operating system. iCal was the first calendar application for macOS to offer support for multiple calendars and the ability to publish/subscribe calendars to WebDAV server.
Originally released as a free download for Mac OS X v10.2 on September 10 2002, with the release of Mac OS X v10.3 it was bundled with the operating system as iCal 1.5. Version 2 of iCal was released as part of Mac OS X v10.4, Version 3 with Mac OS X v10.5 and Version 4 as part of Mac OS X v10.6.
Apple licensed Archived 2016-12-21 at the Wayback Machine the iCal name from Brown Bear Software, who have used it for their iCal application Archived 2010-01-06 at the Wayback Machine since 1997.
iCal development is quite different from other Apple software because it was designed independently by a small French team working "secretly" in Paris, led by Jean-Marie Hullot, a friend of Steve Jobs. iCal's development has since been transferred to Apple US headquarters in Cupertino.