ShoreTel - Cloud phone system & contact center software & services
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
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.
Talkatone - Android App on. Google Play. Stop paying for cell minutes, texts & landlines; Turn your iPad or iPod touch into a phone; Call/Text even in areas with bad cell coverage; Call/Text when travelling without paying for expensive international minutes.