Veyon is the ideal software for classroom control from the teacher's PC. The best part is that it is cross-platform, with versions available for Linux and Windows. It is free software and can be downloaded for free from its official website or from the Linux repository. It must be installed on both the teacher's and the students' machines. It will allow us to easily see which pages the students visit and remove them from those pages from our teacher's computer. We can also block Internet access in the entire classroom while we are giving a lecture and lock the students' computers, or force them to watch the remote broadcast of our desktop with a PowerPoint, for example, so they can follow it from their computers if we don't have a projector in the classroom.

The best part of Veyon was definitely its price (free!), but I have had positive experiences with it from the start- easy install, easy navigation, and subtle presence on the monitored computers.