efficient calendar

Schedule events in a virtual calendar quickly and easily

Syncs both iCal with Google Calendar and Address Book with Google Contacts.

YABI is a simple utility which makes up for iCal’s lack of birthday calendar.

Personal calendar solution; part of Mac OS X 10.6.

InterCal is a date conversion program and perpetual calendar

Convert calendar data in Now Up-To-Date to iCal.

Rili is a very simple, tiny calendar

iSync Palm Conduit allows you to use iSync to synchronize contact and calendar

MiniCal is a free, small and simple FileMaker Calendar.

This is an online organizer, group calendar and IM suite.