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I'm looking for an open-source software that, whenever you are in any fullscreen app, shows the current FPS in a corner.

It must be open-source because I only want the software to study the code.

It can run on Linux or Windows, I don't mind.

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    Any kind of app, for instance games, video players or VM players, whose source code you don't have, right? – Nicolas Raoul Jan 11 at 3:20
  • Yes. According to my research, it's about "hooking a direct3d function call" if it can help... – Julien Lalonde St-jean Jan 11 at 23:55

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