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Asterisk

Free
Asterisk is an open-source software program that lets users develop their own communications systems. The software includes built-in tools that allow individuals to create custom applications
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Circuit

Freemium
Circuit is communications software designed for businesses. It includes text chat, voice chat, screen sharing, file sharing and video chat in an all-in-one package. Some notable customers
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CloudTalk

Paid
Are you tired of boring call center software? Try CloudTalk. io, a new-generation cloud phone system for small and medium businesses. 25+ integrations with most of your favorite CRMs and tools
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FreeConferenceCall.com

The Best Things in Life Don’t Cost a Thing
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Google Hangouts

Similar to a social media page, you can call people and send messages from your mobile device.
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Google Voice

Free
Google Voice is a service that offers many features to your existing phones. This service is mostly used to provide a single phone number that allows people to reach you on all of your devices.
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Grasshopper

Free
Grasshopper lets even small businesses develop a telephone dispatch system that can provide them with the tools they need to look professional and engage their customers more effectively.
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Line2

Paid
Line2 is an inexpensive and convenient service that lets business owners and the self-employed set up a second line for their office easily.
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OfficeSuite

Freemium
A pioneer in multi-device, cross-platform mobile app development since 2001.
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Phone.com

Affordable VOIP business phone service, toll free numbers and virtual pbx features starting under $10/month. View online or call 1-800-998-7087. Try our business voip service free.
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Skype

Freemium
Skype is a one-stop shop for everything you might need related to communication, and it provides all these services in a sleek, easy to use interface. The software can handle text messaging with
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Speek

Freemium
Make conference calls easy to manage and join with Visual Conferencing, included in Jive Voice. Take your conference calls to the next level.
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Telzio

Paid
Cloud phone systems to power business voice, SMS, and fax services. Online software for business VoIP solutions.
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Twilio

Freemium
Twilio is a cloud-based platform as a service (PaaS) that lets software developers add telephony services to their applications using web service APIs. With a few lines of code, programmers
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Voxeet

Free
Build the best user experience possible with the clearest audio with Voxeet voice and video chat SDK, live voice call API. Boost your user engagement.
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