ZoomIt is a free tool that lets you zoom and annotate the screen of your Windows computer.
It can be extremely useful in presentations or demonstrating something on your PC screen.
Zoom and annotation can be activated via a key combination of your choice that can be chosen in the program settings.
It also has a break timer feature, which remains active in the tray if you hide it. This can be very useful in case of timed presentations, for example.
ZoomIt is extremely lightweight and runs discreetly in your system tray.