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

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

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

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

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

  6. Switch is a cloud-based phone system built for Google Apps users.

  7. Business VoIP, cloud phone systems trusted by more than 150,000 companies. Powered by the leading cloud PBX VoIP platform, Nextiva is rated the best business VoIP service provider.

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

  9. Grasshopper enables entrepreneurs to build a virtual office that connects callers to employees, wherever they are.

  10. CrazyCall is cloud based platform for sales and marketing teams doing cold calling, market research, information or loyalty campaigns.

  11. FluentStream Technologies is an advanced telecommunications company with a core focus on cloud-based applications.

  12. Virtual phone system that lets you run your business from anywhere.