Window finder tool (Like Spy++/Autoit)

Question

I have noticed that many apps use (what seems like) the exact same control to find/select external windows. The tool looks like this:

Is this a standard component that I can import from somewhere? Maybe it just has a weird name I can't find?

I've nearly replicated the functionality but this finder tool looks much better than mine. Here's some screenshots of just two of the places I've seen this component:

Answer 1

Hmm. I started searching for Spy++ source code and came across many examples!

• joeyespo/window-finder-control
• r1pper/WindowSpy
• Custom VCL Control for getting window handles. (Spy++ style reticle)
• MS Spy++ style Window Finder
• .NET Object Spy and InvokeRemote
• WinSpy.ahk - Window Information Tool

Thanks for the help everyone!