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NanoXLSX is a small .NET library written in C#, to create and read Microsoft Excel files in the XLSX format (Microsoft Excel 2007 or newer) in an easy and native way
PicoXLSX is a small .NET / C# library to create XLSX files (Microsoft Excel 2007 or newer) in an easy and native way
YACA (Yet Another Collection Approach) is a collection library for TypeScript / JavaScript