ExcelDna.AddIn (nuget): Excel-DNA eases the development of Excel add-ins using .NET.           Add-ins created with Excel-DNA can export high-performance user-defined functions and macros, and can be packed into a single file for easy distribution and installation.            Excel versions 2007 through 2021 / Office 365 can be targeted with a single add-in.           Advanced Excel features are supported, including multi-threaded recalculation, registration-free RTD servers and customized Ribbon and Task Pane interfaces and asynchronous functions.            Excel-DNA supports .NET Framework version 4.5.2 to 4.8, and.NET 6.0 (in preview).            The Excel-DNA Runtime is free for all use, and distributed under a permissive open-source license that also allows commercial use.
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