This post was published 6 years ago and the download links can be irrelevant.
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Full Screen Calculator v4.4 Multilingual MacOSX 400KB
This standard algebraic calculator takes full advantage of the new Full Screen Mode in Lion. And when you're not using the calculator in full screen mode, the window is fully resizable.All the essential functions for everyday calculation are included. Memory registers are saved, even when you quit the app.