Remind! 

Remind! is a versatile intuitive tray-based application. It allows to create and schedule reminders than can pop up messages with optional sound effects; start applications or open documents; and shut down, reboot, log off, or power down your system.
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WinDates 

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iCal 

iCal is a web calendar server. Anyone with a web browsers can access the calendars on their local Intranet or Internet. Any number of calendars can be created and accessed by any number of users. Security controls who can make calendar entries.
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SuperCool Calendar 

SuperCool Calendar - PIM software about calendar with alarm and reminder. Ever felt that you have problems managing your time? With SuperCool Calendar on your Windows desk this will never be a problem again. No more missed meetings or birthdays...
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FF Event Calendar 

Never forget another birthday, appointment, anniversary, meeting or special day again! Schedule database supports over a billion event records! Unlimited reminders! Schedule and remember ANYTHING! Complete online help to get you started!
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Out n About! 

Out n About! is an In/Out Status Board with integrated phone message pad, event calendar, Internet connectivity, and Wireless Access Protocol (WAP) support.
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