https://www.zoiper.com/
Zoiper - Free VoIP SIP softphone dialer with voice, video and instant messaging :: Zoiper
Zoiper, the free softphone to make VoIP calls through your PBX or favorite SIP provider. Available for iPhone, Android, Windows Phone 8, Windows, Mac and Linux.
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https://www.microsip.org/
MicroSIP - lightweight VoIP SIP softphone for Windows - Official Homepage
MicroSIP is a portable SIP softphone based on the PJSIP stack available for Microsoft Windows operating systems. It facilitates high quality VoIP calls (p2p or...
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