Briar - Secure messaging, anywhere
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.
The Serval Mesh - It works by using your phone's Wi-Fi to not communicate with other phones on the same network.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
WorldChat - Meet new people around the World on WorldChat.tv, the Original World Chat since 2011.
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.