CozyCal - Online appointment scheduling
Sorted - Sorted³ has been crafted to make scheduling quick and easy. Try it for a few days and it may very well become a productive, yet enjoyable part of your day.
SavvyCal - A scheduling tool both the sender and the recipient will love.
RobinPowered - Robin coordinates meeting spaces, people, and things in your office. Complete with analytics and insights that uncover usage and help optimize space.
Cogsworth - Make it easy for your customer to schedule time with you! Sync your Cogsworth to your calendar, set up your services, embed it on your website, and you're cooking with gas!
FreeBusy Scheduling Assistant - Coordinate meetings 10x faster from Skype, Slack, Echo