Duplicate Windows is described as 'visually copies any window in Mac OS X live and on-the-fly. It’s like display mirroring for individual windows! I created the tool to display windows across multiple monitors in extended desktop mode during presentations'. There are eight alternatives to Duplicate Windows for Mac, Windows, Google Chrome and SIMBL. The best alternative is OnTopReplica, which is both free and Open Source. Other great apps like Duplicate Windows are PiP for Mac (Free, Open Source), Afloat (Free, Open Source), PiP-Tool (Free, Open Source) and Picture In Picture (Paid).
A lightweight application that provides a real-time thumbnail replica of any window of your choice. OnTopReplica will stay always on top, allowing you to keep track of the original window while working and without having to keep the keyboard focus on it.
Clone any visibile window Crop the preview Auto and manual resize preserving the aspect ratio Multiple window preview from same process, cmd+n to open and cmd+w to close Pinch to zoom Click-through Opacity control
Keep windows afloat (heh) on top of all others. Pin windows to the desktop. Move windows from anywhere, not just the title bar. Turn a window into an "overlay" on your screen that doesn't hinder your work.
PiP tool is a software to use the Picture in Picture mode on Windows. This feature allows you to watch content (video for example) in thumbnail format on the screen while continuing to use any other software on Windows.
Picture in Picture (PiP) allows watching videos from the internet while working at a computer. Using unique algorithms, the program finds videos on web pages and allows to open them in a floating window, that remains in the front.
Overlay2 is like digital tracing paper for your computer. It opens a semi-transparent floating image over video capture or editing software, or 3D modelling software, so you can use the image as a reference or positioning guide.
A frame that allows you to have an image or even PDF displayed semi-transparently in front of everything. It enables you to copy, trace, or compare designs, images, and documents with ease, since you can lock the frame and make it undisturbed by mouse gestures.