WhatsApp Status - An encrypted Snapchat Stories clone
Future - Calendar events around the clock
Messenger Day by Facebook - Share your day in Messenger
GetStream.io - APIs for the development of scalable newsfeeds and chat applications.
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Event Calendar App - A simple, easy to manage, way of displaying events