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.

Google Calendar - Spend less time managing your day & more time enjoying it

Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.

Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere

SavvyCal - A scheduling tool both the sender and the recipient will love.

Sunsama - Calendar and scheduling for teams