Outplanr - Turn your to-do list into a real work plan
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Plan - Plan is a better way to organize.
Google Calendar - Spend less time managing your day & more time enjoying it
Laps Beta - Client, project and time management
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.