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Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
Linphone - Linphone is an internet phone or Voice Over IP phone (VoIP).
Mitel - Business Communications and Collaboration
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
Phonebooth - Phonebooth is one of the leading voip providers, providing phone systems & phone service for small businesses.