LAN School

Lanschool is classroom management software that allows teachers to control student screens.  It gets pretty good reviews. However, it is pricey so would have to be a system-wide purchasing decision.

You can download a free trial of Lanschool to your desktop and a teacher and students app is then free to support that downloaded software.

The software described by the LAN school developers:

I haven't trialed it yet but will do next semester. Has anyone seen it in action?