Itsycal is a tiny menu bar calendar. If you want, it will display your events as a companion to the Mac Calendar app. You can also create and delete (but not edit) events.
Costie is a meeting cost calculator. It takes the - before-tax preferably - salary amounts of the participants and runs a timer with the meeting's cost per second. The salary fields are safe in password fields and are destroyed the moment the user navigates to the timer, with the application keeping only the sum of all salaries per second.