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.
Google Calendar - Spend less time managing your day & more time enjoying it
Meeter - Hop in and out of calls, directly from your menu bar
CalenGoo - Features | 1.0.175 for Android™
CalendarZ - CalendarZ is a simple yet high-level calendar application, introduced lots of advanced functions and features.
BusyCal - powerful calendar app for macOS