Sunbird is a Mozilla project to build a cross-platform calendar client based on the open iCal standard. The application is targeted at Mozilla based browsers, Mozilla Firefox, Mozilla Thunderbird and the Mozilla Application Suite. At the project website you can look at screenshots, download the latest version, and read about plans for future releases. It also contains information how developers and non-developers can contribute to the Sunbird project.
Sunbird is Open Source and licensed under the Mozilla Public License, the GNU General Public License, and the GNU Lesser General Public License. Builds haven been released for Linux, Windows and Mac OS X.