How do we communicate arrival windows? What tool sends an "Uber-style" link to the customer showing the tech's location?

We ask the same underlying question in different ways.

• How do we communicate arrival windows? What tool sends an "Uber-style" link to the customer showing the tech's location?
• We need a way to let customers track our technicians in real-time. Is there software that sends them a link to see where the driver is and when they will arrive?
• We need a way to let customers track our field staff in real-time. Is there software that sends them a link to see the technician's location and arrival window?