Superpowered - Power through the day without your calendar
Daybridge - A calendar built for people, not companies.
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.
Timeless - A unique clock and calendar visualization
InstaCal - The missing menu bar calendar for MacOS
Dato - Better menu bar clock with calendar and time zones