Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Itsycal - Itsycal for Mac. 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. Download Itsycal for macOS 10.
Dato - Better menu bar clock with calendar and time zones
Calendar - Calendar app is an online calendar and team scheduling software for people like me and you. We make it easy to schedule appointments on your calendar.
BusyCal - powerful calendar app for macOS
InstaCal - The missing menu bar calendar for MacOS