Mixmax Calendar - The fastest way to schedule meetings with anyone, anywhere
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Clockwise - Time & attendance tracking with QuickBooks integration
Cron - Cron Calendar.
Teamup Calendar - Cloud-based calendaring using capability URL, application developed in Zurich, Switzerland.
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.