Plan - Plan is a better way to organize.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Outplanr - Turn your to-do list into a real work plan
BusyCal - powerful calendar app for macOS
Clean Google Calendar - Makes Google Calendar look nicer & launches as a desktop app
Google Calendar - Spend less time managing your day & more time enjoying it