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OpenXLSX
A C++ library for reading, writing, creating and modifying Microsoft Excel® (.xlsx) files.
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Recently, I found the XLNT library on GitHub (https://github.com/tfussell/xlnt). It was not available when I began developing OpenXLSX. To be honest, if it had, I wouldn't have begun OpenXLSX. It has a larger feature set and probably has fewer bugs. However, I decided to continue developing OpenXLSX, because I believe that in a few areas it is better than XLNT. Primarily, OpenXLSX is better able to handle very large spreadsheets (up to a million rows).