attending.io - Tiny event pages to ask people one question – are you attending? Twitter login.
Ticket Tailor - Ticket Tailor is an easy to use event ticketing platform that puts you in control.
Eventzilla - Eventzilla lets you sell tickets online and manage attendees from one integrated application.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
EventMobi - EventMobi is an interactive mobile event app, audience response and engagement platform for conferences and trade shows.
idloom-events - idloom-events management software is a complete and professional tool that manages all the preparations for your event: website, online registrations, reservations, payments, etc.