Pulse 24/7 - Booking & scheduling mobile app for service providers
Microsoft Outlook - Organize your world. Outlook’s email and calendar tools help you communicate, stay on top of what matters, and get things done.
Dudle - Dudle is an online scheduling application, which is free and open source.
Fantastical 2 - Fantastical, the Mac calendar app you'll enjoy using. Quickly create new events with natural language input and more.
Time Slot Booking Calendar PHP - Time Slots Booking Calendar PHP for online appointment booking and class scheduling.
Simple Calendar - A simple calendar with events (optional recurring and reminders), week numbers and a customizable...