Effortless - Stay focused and beat procrastination on your Mac.
Cron - Cron Calendar.
Be Focused by XWaveSoft - Simple Pomodoro timer in your Mac's menu bar
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
Forest App - Forest is an app that helps you stay focused on the important things in life.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.