CryptPad - CryptPad is a collaborative office suite that is end-to-end encrypted and open-source.
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.
eduPad - Real-time collaborative text-editor. No account required. Edits highlighted in authors color.
Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Etherpad - Etherpad is a highly customizable Open Source online editor providing collaborative editing in...
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.