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.
SavvyCal - A scheduling tool both the sender and the recipient will love.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
FreeBusy - Easiest way to share availability across calendars for free
TidyCal - Optimize your schedule with custom booking pages and calendar integrations
Calendbook.com - Share open time slots with links. Customers book in 3 clicks