Superpowered - Power through the day without your calendar
Plan - Plan is a better way to organize.
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.
Kin Calendar - The simple and connected calendar
InstaCal - The missing menu bar calendar for MacOS
Kin - Kin is money for the digital world. It is used to generate value through a shared, decentralized cryptocurrency in a digital ecosystem of apps and their users.