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Telegram - Telegram is a messaging app with a focus on speed and security. It’s superfast, simple and free.
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
WhatsApp - WhatsApp Messenger: More than 1 billion people in over 180 countries use WhatsApp to stay in touch with friends and family, anytime and anywhere.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Digsby - Tagged makes it easy to meet and socialize with new people through games, shared interests, friend suggestions, browsing profiles, and much more.
Sipdroid - Free and open-source SIP/VoIP Client