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Clean Google Calendar - Makes Google Calendar look nicer & launches as a desktop app
Cron - Cron Calendar.
Plan - Plan is a better way to organize.
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
Calndr.link - Dead simple & free add to calendar links + API
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.