MenuCalendarClock iCal gives you instant access to your iCal calendars from a menu bar icon.
Add-in to iCal that gives the user options for how replies to meeting invites that are sent with Mail are dealt with.
Menu Extra Enabler is a utility that will enable third-party menu extras on Mac.
Alternative to Apple's iCal birthday calendar that has a range of features that has made it indispensable for many iCal and Address Book users.