Superpowered - Power through the day without your calendar
Loxi - Easily add an events calendar to any website.
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.
Future - Calendar events around the clock
InstaCal - The missing menu bar calendar for MacOS
Whenever - Casual calendar app for iOS