1. Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.

  2. WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.

  3. Fast, simple & secure messaging. Privacy that fits in your pocket.

  4. A messaging app for teams who see through the Earth!

  5. Powerful open source group chat

  6. Meet Telegram X for iOS and Android – two new official apps that offer more speed, longer batter life and smooth animations.

  7. HipChat is hosted group chat and video chat built for teams. Supercharge real-time collaboration with persistent chat rooms, file sharing, and screen sharing.

  8. Mattermost is an open source alternative to Slack.

  9. Secure messaging, video, calls and sharing for individuals, teams and enterprises

  10. Cisco Jabber lets you access presence, instant messaging (IM), voice, video, voice messaging, desktop sharing, and conferencing.

  11. Messenger is a communications platform designed for businesses and developers.

  12. Send messages, files, create groups and make Tox to Tox audio and video calls. Securely.