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Sipdroid - Free and open-source SIP/VoIP Client
Dingtone - Dingtone is a free call and texting application for making unlimited calls and text messages to any number at the moment registered in any part of the world by any cellular company.
Zoiper - Cross-platform VoIP softphone dialer for SIP and IAX systems
FluffyChat - Open. Nonprofit. Cute ?
MicroSIP - MicroSIP is a free portable SIP softphone for Windows based on PJSIP stack.
TextMe - TextMe is a free calls and messaging application at both local and international levels.