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Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Intercom - Intercom is a customer relationship management and messaging tool for web businesses. Build relationships with users to create loyal customers.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Smallchat Beta - Slack integration for chatting with visitors to your website
Sipdroid - Free and open-source SIP/VoIP Client
Firehose Chat - firehosechat.com