Wickr - Wickr is a free end-to-end encrypted text, video, picture and voice messenger with full sender...
Zoom - Equip your team with tools designed to collaborate, connect, and engage with teammates and customers, no matter where you’re located, all in one platform.
Burn Note - Burn Note is the name of a continuous private messaging utilizing which you can have an ongoing private discussion with your companions or any individual who is at Burn Note.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
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.