CalendarBar is a unique way to keep track of your events. It shows a list of upcoming events in your menubar where it's easy to access from any application. CalendarBar supports Facebook, iCal, and Google Calendar all in one place.
Google Calendar Sync
Syncing with Google.
The company Clean Cut Code closed down, therefore Cloud Calendar and CalendarBar have been discontinued.
Superpowered is a calendar app in your menu bar. See your daily schedule and join meetings without having to go to your calendar.