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OnTopReplica is a Windows application that allows you to clone a window then crop a subregion of it and keep it always on top (useful if you're trying to keep a YouTube Video always showing).

Is there any alternative for Linux installations (specifically Ubuntu or Linux Mint)? I tried looking for some sort of Compiz plugin that could emulate this, but I'm not sure where to start...

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Would it be enough to size the window to the portion you want, remove the decorations (title bar etc) and make the resulting window always-on-top? Most window managers can do this. –  Paul Dec 5 '11 at 23:11
That requires so much more work on the end-user with less features (for example, OnTopReplica allows you to resize the region you crop to zoom in or out on it easily). –  Steve K. Dec 6 '11 at 0:32
Yeah I figured, thought it was worth mentioning –  Paul Dec 6 '11 at 0:37

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