TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
ShoreTel - Cloud phone system & contact center software & services
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.
CorvisaOne - CorvisaOne is another cloud-based communications suite that is specially designed for companies that need features for managing inbound or outbound call centres.
TextMe - TextMe is a free calls and messaging application at both local and international levels.
8x8 X Series - X Series connects teams across channels and around the globe, giving you access your most critical information securely, from any location.