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.
Linkello - Video calls simplified, no installation required.
Zulip - Chat for distributed teams. Zulip combines the immediacy of real-time chat with an email threading model. With Zulip, you can catch up on important conversations while ignoring irrelevant ones.
SeaFour.club - Get ready for the future of social metacommunication. Social metacommunication? What's that even mean?
WowApp - Wowapp is the best alternative to Skype and you will get paid to use it!
Torchat - TorChat is a peer to peer instant messenger with a completely decentralized design, built on top of...