Sunbird, Mozilla.org's Open Source calendar program, was updated to version 0.5 on Thursday.
Sunbird, while developed by the Mozilla team, is designed to work independently from an e-mail program like Thunderbird. However it does support Google Calendar. Lightning, a calendar extension for Thunderbird, that handles meeting invitations via e-mail and integrates with Thunderbird.
Lightning and Sunbird 0.5 offer a major user interface update, event invitations, printing improvements and better integration with Mozilla Thunderbird.
Sunbird can import calendars from iCal because they use the same file format. The Mozilla Calendar FAQ explains the use of Sunbird, its features, and limitations.
Sunbird and Lightning can be downloaded from Mozilla.org Calendar Project and both are available for Mac OS X, Linux and Windows platforms.
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