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

Undock - Instantly schedule meetings without looking at a calendar

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.

Worksphere - Workplace management software for hybrid teams. Easily book desks, know who's in office, and improve team collaboration from one intuitive platform.

Cron - Cron Calendar.

Mixmax - At Mixmax, our mission is to change how the world communicates. We’re an email productivity platform that helps sales, customer success, and recruiting teams do their jobs better.