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

  2. Hangouts bring conversations to life with photos, emoji, and even group video calls for free. Connect with friends across computers, Android, and Apple devices.

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

  4. RingCentral is the leading provider of cloud-based communications and collaboration solutions for small business and enterprise companies

    freemium $19.99 / Monthly (All-in-One Phone, Team Messaging, and Video Conferencing.)

  5. Free and secure calls and messages to anyone, anywhere. Keep your conversations going no matter where you are.

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

  7. Skype for Business, formerly Lync, is unified communications platform that enables instant messaging, conferencing and online meetings

  8. Private & Secure Messenger

  9. Facebook Messenger is a faster way to message.

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

  11. Open-source video calling and chat platform.

  12. Google Voice gives you one number for all your phones, voicemail organized in an email format, free...