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.
Google App Engine - A powerful platform to build web and mobile apps that scale automatically.
Acuity Scheduling - Automate your client bookings, cancellations, reminders & payments using the worlds friendliest online scheduling software.
Dokku - Docker powered mini-Heroku in around 100 lines of Bash
SimplyBook.me - Online scheduling software that offers you a beautiful customisable booking website (or widget to your own website) to accept bookings and payments with the possibility of selling products as well.
Google Cloud Functions - A serverless platform for building event-based microservices.