Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Telegram X - Meet Telegram X for iOS and Android – two new official apps that offer more speed, longer batter life and smooth animations.
OfficeChat - OfficeChat is a secure messaging app to share rich messages, documents, pictures, videos and location with their colleagues.
Facebook Messenger - Facebook Messenger is a faster way to message.
Spray - Local chat, made simple
Send - Instant messaging meets email (by Microsoft)