Rainlendar

Rainlendar is a useful calendar which will be placed on the tray bar to remember you your important (and not so important) dates.

Maybe what impress you the most about Rainlendar is its marvelous skin system, designs and transparencies. You will be able to download hundreds of skins from its Official Site, set up alarms, set events, configure visualization settings,...

This is what a lot of people was expecting: Easy to use, free, and it doesn't require to be installed.