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Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Slack with your Users - Speak to your app's users entirely within Slack
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
Conversity - Easiest way to manage Facebook Messenger chats
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Avochato - Text messaging for your business.