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.
Croodle - Croodle is a web application to schedule a date or to do a poll on a general topics.
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.
zcal - zcal is the fastest way to schedule every meeting for Free and make it personal.
RapidReg - Create easy online registration forms to capture data, take payments and improve your contactless customer experience