Rainlendar

Rainlendar is a customizable calendar that displays the current month.

It is a very lightweight application that doesn't use much system resources or take much space on your desktop.

(click for a larger version)

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

http://www.ipi.fi/~rainy/index.php?pn=projects&project=rainlendar