Ring4 - Manage business phone line as easily as you manage emails, in the cloud. Ring4 provide you with a business line and video conferencing solution.
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
SpotMenu - Spotify and iTunes in your macOS menu bar
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.
OpenPhone - Simplest way to own a business phone number
TextMe - TextMe is a free calls and messaging application at both local and international levels.