Rainlendar is a higly customizable and feature rich free desktop calendar. Its is very easy to use also will consume very less space and memory.
Set Events and To-do list: You can add the forthcoming events in the Events list also the you can list the works in To-do list, to plan your schedules. You can even set alarm prior to an event, also there is option for highlighting due events.
Rich themes: Rainlendar has rich set of customizable themes, even you can mix two themes!!!.
Interoperable : Rainlendar uses the standard iCalendar format to store its events and tasks so you can easily transfer them between different calendar applications.
Support Windows and Linux: They have both Windows and Linux versions of Rainlendar.
[ Download Rainlendar for Windows ] [ Download Rainlendar for Linux ]