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Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Spectrum - Browser-based app to visualize the frequencies of an audio file.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Nertivia - Chat Client - Chat with friends or anyone around the world, free gif and emoji support.
Sipdroid - Free and open-source SIP/VoIP Client
Facebook Chat for Websites - Talk to your customers using Facebook Messenger