Huckle - Send group messages to people at places
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
CAKE - CAKE provides a SaaS-based solution for advertisers, publishers and networks to track, attribute and optimize their spend in real-time.
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.
Chalk - Chalk is a calculator that tries to do right what others do wrong.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.