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.
Letsfind - Letsfind is a fast, easy-to-use, ad-free way to create online (meeting) polls.
SavvyCal - A scheduling tool both the sender and the recipient will love.
CozyCal - Online appointment scheduling
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
FreeBu - Smart free/busy calendar sharing and meeting organizer.