Clockwise.com - A suite of tools that give individuals and teams the time and focus to accomplish their priorities
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.
Kaboome - Kaboome is a revolutionary new time blocking application that aims to improve the way people manage their time and increase productivity.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
ReclaimAI - Helps users prioritize their work and personal calendars
Notion Calendar - All of your commitments, now in one place. Meet the beautifully designed, fully integrated calendar for your work and life.