Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Virtual Booth - A photo booth for virtual events
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
GetStream.io - APIs for the development of scalable newsfeeds and chat applications.
Ticket Tribe - Sell tickets online with no fees per ticket
Roomkey - Gamified social network for virtual events