Rainlendar is a customizable calendar that displays the current month, events, and reminders. It is a very lightweight application that doesn´t use much system resources or take much space on your desktop.

Features:

• Small and lightweight
• Different type events can have different appearence
• Supports Windows transparency
• Synchronizes events between several clients
• Localized for multiple languages
• Shows an alarm when an event is due
• Supports iCal files.
• Shows Outlook's appointments
• Includes a todo-list
• Works also as Litestep plugin
• Displays the current date in tray icon
• Can stick to the desktop (i.e. doesn't hide with Show Desktop)
• Hotkeys for quick access
• Easy skinning with an UI
• Can be controlled from 3rd party applications with !bangs
• and more...

System Requirements:

• Windows XP SP3/2003/Vista/7
• 15 MB of available hard disk space
• 512 MB of RAM or higher recommended
• A display card capable of showing transparent windows

What´s new in version 2.9:

• Enabled the 'Show in all desktops' setting in Mac (needed by Lion).
• The due date for Google tasks changed to the previous day because of timezone conversion.
• Newlines in the task description were not stored properly to Google tasks.
• The Google calendar is only shown as the target if the events/tasks are actually read from the server.
• Edit control was left visible when the window was hidden. This showed a small black dot on the desktop.