B12 Bookings - Bookings scheduling software that integrates with your site
Calendify - Calendify is an event community where you can share, publish, and subscribe to event calendars. It helps you to stay informed about what you are interested in and what is yet to come.
Klook - Discover & book amazing experiences at exclusive prices
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Eventjoy - The Easiest Way To Organize An Event
Pickevent - Personalised event recommendations based on your interests