Rainlendar is a calendar program for Windows, Mac OS X and Linux.

[1] Rainlendar has small space and memory requirements and a customizable user-interface (using skins).

The calendar can be placed on the desktop and can be managed using the Windows notification area.

It has common functions such as task list and a reminder alarm.

[3][1] In addition to the stand-alone calendar program, Rainlendar-server is available for Windows and Linux, which can synchronize distributed Rainlendar applications.