Itsycal is a (free) tiny calendar for your Mac’s menu bar, synchronizing with your Mac calendar app. You can also create and delete events.
Jump in Meeting lets you jump from a teleconference meeting to another call during your day. The app integrates with Calendar and supports all the popular teleconference and video calls platforms.
MenuMinder is a menu bar app for keeping your plans in order and making sure you are reminded of the tasks and plans you have set for yourself.
Mini Calendar is a lightweight menu bar app, which helps you to access your monthly calendar. It can display just an icon with the date, but also the time, the day of the week and the sunrise and sundown times.
Quickly see your next meeting right in your menu bar.