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

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

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

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

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

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

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

  10. Open-source video calling and chat platform.