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ClosedXML
ClosedXML is a .NET library for reading, manipulating and writing Excel 2007+ (.xlsx, .xlsm) files. It aims to provide an intuitive and user-friendly interface to dealing with the underlying OpenXML API.
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If you mean library, the older version of EPPlus is still available.
I use ClosedXML for Excel manipulation - though it does use quite a bit of memory if you aren't careful.
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Hence, a higher number means a more popular project.