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Calendly - Say goodbye to phone and email tag for finding the perfect meeting time with Calendly. It's 100% free, super easy to use and you'll love our customer service.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Cron - Cron Calendar.
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
Woven Calendar - An intelligent calendar
SavvyCal - A scheduling tool both the sender and the recipient will love.