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

  2. Screenleap is a web app that lets users share their device's screen over the Internet. These screens can be a desktop computer monitor or a smartphone screen or anything else that can load a web browser. Read more about Screenleap.

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

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

  5. Quickly capture what's on your mind and get a reminder later at the right place or time.

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

  7. UberConference provides a rich visual interface for conference calls. Simple, visual, and free to use, it's audio conferencing done right.

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

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

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

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