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Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Smooch.io for Facebook Messenger - Message your customers from Slack, Front, a bot or anywhere!
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
GetChat.App - Add WhatsApp chat to your website for free
Sipdroid - Free and open-source SIP/VoIP Client
Avochato - Text messaging for your business.