Vysor is offered in a free version and in a premium version. The free version mirrors via USB cable. The free version will also display an advertisement from time to time. I used the free version this afternoon during an hour long webinar and the advertisement only appeared twice. The premium version of Vysor offers wireless mirroring, no advertisements, and a drag-and-drop file transfer between your phone and computer.
Applications for Education
Vysor is a convenient tool to have at your disposal when you want to demonstrate an Android app during a webinar as I did this afternoon. Vysor is also useful if you don't have another way to project your phone's or tablet's screen to an LCD projector. You can do that by mirroring your phone to your computer that is connected to a projector.
