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Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Mitel - Business Communications and Collaboration
Sipdroid - Free and open-source SIP/VoIP Client
Phonebooth - Phonebooth is one of the leading voip providers, providing phone systems & phone service for small businesses.