TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
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.
Mitel - Business Communications and Collaboration
TextMe - TextMe is a free calls and messaging application at both local and international levels.
VoIP.ms - VoIP.ms is a VoIP origination and termination tool.