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.
Meetsy - Invite friends for your events and gather everybody's photos
WPAmelia - Award-winning WP booking plugin that manages services, appointments, customers, events, analyze business performance, and accept payments online.
Dotcal - Personalized booking pages for absolutely everyone
Booknetic - WordPress Appointment Booking System
Meeting Scheduler for Gmail - Easy scheduling directly from Gmail