FluffyChat - Open. Nonprofit. Cute ?
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.
Signal - Fast, simple & secure messaging. Privacy that fits in your pocket.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Molly (Signal fork) - Molly is an independent Signal fork for Android
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.