SpotMenu - Spotify and iTunes in your macOS menu bar
TextNow - TextNow is a mobile virtual network operator (MVNO) that provides a free phone service to users by using other cellular networks coverage.
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.
Google Voice - Google Voice gives you one number for all your phones, voicemail organized in an email format, free...
OpenPhone - Simplest way to own a business phone number
Burner - Disposable phone numbers -- now with MMS photo support