Todoist - Todoist is a to-do list that helps you get organized, at work and in life.
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.
Laverna - Laverna is a JavaScript note taking application with Markdown editor and encryption support.
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
doo - A smart, simple app for reminders and to-dos
Doodle - Make meetings happen. With Doodle, scheduling becomes quick and easy.