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

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

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

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

  7. 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.)

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

  9. Facebook Messenger is a faster way to message.

  10. Jabber.org is an IM service based on XMPP and one of the key nodes on the XMPP network.

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

  12. Trillian is a decentralized and federated instant messaging platform that lets your whole company send private and group messages, keep tabs on what co-workers are doing, share files, and much more.