Mozilla Calendar is a calendar and personal information manager based on the open iCal standard. It can be run as an extension to the Mozilla internet software suite, the Mozilla Firefox web browser, or the Mozilla Thunderbird e-mail client. A stand-alone version of it, called Mozilla Sunbird, is currently in development.
As with other Mozilla projects, Mozilla Calendar is cross-platform, and uses the XUL user interface language. It works with Microsoft Windows, Linux (on both PC and PowerPC), and Mac OS X.