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.
Textnow.com - It lets you text your friends, aka my only source of happiness
8x8 X Series - X Series connects teams across channels and around the globe, giving you access your most critical information securely, from any location.
FluffyChat - Open. Nonprofit. Cute ?