Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Cal.com - Cal.com (formerly Calendso) is the open source Calendly alternative.
Splash - Anyone can create a Splash event, whether you're a company hosting a single event or an individual hosting a personal event like a birthday or wedding. Get Started for Free. Text goes here. X. Full Event Program.
WhenWorks - Mobile appointment scheduling
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
Inspora - virtual chat-stylist for fashion advice.