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Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Slack - A messaging app for teams who see through the Earth!
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Microsoft Teams - Microsoft Teams provides the enterprise-level security, compliance and management features you expect from Office 365, including broad support for compliance standards, and eDiscovery and legal hold for channels, chats, and files.
Sipdroid - Free and open-source SIP/VoIP Client
Wrinkl - Group messaging built for business