WindowWatcher might be a bit more popular than Duplicate Windows. We know about 1 link to it since March 2021 and only 1 link to Duplicate Windows. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
I haven't used this personally, but it may get you some of the way there: Duplicate Windows app. Source: about 1 year ago
To see the map on your own screen, I duplicate the window using WindowWatcher. Source: almost 3 years ago
Afloat - Create beautiful invoices in 3 clicks, without mistakes
ZoomIt - Presentation utility for zooming and drawing on the screen.
PiP for Mac - Always on top window preview similar to the popular windows only OnTopReplica
Magnifixer - Magnifixer is a screen magnifier utility.
Pennywise - Cross-platform application to open any website or media in a floating window
PiP-Tool - PiP tool is a software to use the Picture in Picture mode on Windows.