GetStream.io - APIs for the development of scalable newsfeeds and chat applications.
Eventbrite - Discover Great Events or Create Your Own & Sell Tickets
Geneva - An all-in-one communication app for groups & communities
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
Ditto - Easy to use interface; Search and paste previous copy entries; Keep multiple computer's clipboards in sync; Data is encrypted when sent over the network; Accessed from tray icon or global hot key; Select entry by double click, enter key or drag drop…
Ticket Tribe - Sell tickets online with no fees per ticket