Rainlendar

Rainlendar is a calendar program for Windows, Mac OS X and Linux. Versions prior to version 2 are licensed under the GNU GPL as free software, but subsequent versions are proprietary shareware with the paid version costing 9.95 euros.

Features
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. Different event types can be represented with different symbols. Calendars can also be imported or synchronized using common file formats such as Outlook, iCal, and iCalendar files (using a plugin).

In addition to the stand-alone calendar program, Rainlendar-server is available for Windows and Linux, which can synchronize distributed Rainlendar applications. The program can also be used as a LiteStep plugin.

Rainlendar supports 60 languages as of 2016.