The free transparent customizable calendar called Rainlendar is a great addition to every windows system. Rainlendar is a lightweight open source application which supports lots of languages (must be 30+). It displays three independent transparent windows on your desktop, the calendar showing the actual month, a todo list and an events list. You can add or edit entries by doubleclicking the window.

You are able to set alarms for events and synchronise the calendar between different clients. It supports iCal and Outlook appointments, offers hotkeys and several additional skins.
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Although this is a neat little app, those of us using Lotus Notes are left out in the cold. There are no plugins available now or in the near future that would allow sync of calendar entries.
How do I download the calendar thier so much junk on the page I can’t find the calendar