Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
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.
Conversations.im - XMPP client designed with ease of use and security in mind
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Telegram X - Meet Telegram X for iOS and Android – two new official apps that offer more speed, longer batter life and smooth animations.
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.