SpotMenu - Spotify and iTunes in your macOS menu bar
Callmama - Get cheap international calling, international virtual number, Call Mama Gives an added advantage to send message and make calls to non-user of Callmama App.
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.
CallHippo - Easy to use Phone System with World-Class Support
OpenPhone - Simplest way to own a business phone number
KrispCall - Virtual cloud phone system for business