Google Voice

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GoToConnect

Viber is a cross-platform voice over IP application that allow people to make free and secure calls and messages to anyone, anywhere. With Viber, you can create group chats and make group calls, send stickers and emojis over chats that are 100% synced between devices, including 1-tap transfer of calls. Viber is available for free on Android, iOS, macOS, Linux and Windows.

Skype is a telecommunications application that specialize in providing video chat and voice calls between computers, tablets, mobile devices and consoles. The software allows you to connect with friends and business colleges worldwide. Skype provides free online calls, messaging, affordable international calling to mobiles or landlines and Skype for Business for effective collaboration among teams.

Yammer is a freemium social network for enterprise collaboration. Yammer provides features that allow organizations to communicate and collaborate privately across teams and departments. Access to Yammer is determine by the user email address and domain, which means that only individuals with approved email addresses may join their respective networks.

Salesforce Chatter is part of the Salesforce suite of tools and allows you to take advantages of social networking to work for your business. Salesforce Chatter is a collaboration tool that connects people and information, similar to that of a social network.