Eventbrite - Discover Great Events or Create Your Own & Sell Tickets

EventsAIR - EventsAIR is a meeting management solution that allows meeting managers to access their event data in real-time, see room layouts, delegate tasks, and set up alerts, all while keeping everyone connected within the same environment.

Attendize Event Ticketing - Attendize is a free & open-source ticket selling and event management platform

Eventsquid - Eventsquid is a SaaS-based event management and registration software for corporate and small-scale event planners.

pretix - pretix helps you to sell tickets for your event in an easy way. It supports multi-lingual events and provides a wide range of features

Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.