CozyCal - Online appointment scheduling
Undock - Instantly schedule meetings without looking at a calendar
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.
Betty - Your Personal Scheduling Assistant
RobinPowered - Robin coordinates meeting spaces, people, and things in your office. Complete with analytics and insights that uncover usage and help optimize space.
Omnify - Omnify is a small business software to manage your scheduling, automate your work-flow and sell online.