OnTopReplica

OnTopReplica displays a real-time copy of any desired window on top of all your windows, which is very useful for many programmers, or even if you just want to watch a video as you work. 

Features:

• Displays your desired window on top of all your open applications.
• OnTopReplica lets you resize the replica, even to full size, show only a selected region of the source window and lock it into your desired corner. 
• You can change the opacity of the window if you want to make the window "see-through"
• Adjustable mouse controls so you can interact with your windows to suit your work style: use click forwarding to send clicks to the original window, or click-through to ignore clicks on the replica. 

This simple real time replica of any window makes it easier to monitor a desired window without having to go back and forth between windows.

OnTopReplica (for Windows) is a useful download for any coder, business person, or power user that constantly works with various open windows. OnTopReplica makes it easy to place the desired window on top of your window workflow, so you can easily and continuously monitor particular windows, such as code, or even your favorite YouTube videos.

OnTopReplica also gives you the option to change the opacity of the window, adjust your mouse interactions, change window sizes and much more. Best of all it is free and open source, with the code available in a GitHub repository under the Microsoft Reciprocal License. It needs the .NET Framework and Windows desktop composition (Aero).