LibWorkbooks is provided as a software component for evaluating large spreadsheets, with comparable performance - and compatibility with Excel.
LibWorkbooks can run on Linux, macOS, and Windows.
Compatible with .NET Standard 2.0 (.NET Framework 4.7 and newer).
Custom functions can be defined in your own .NET assemblies and added directly to the workbook evaluator.
The MIT License is a permissive license that puts very little restriction on reuse and has reasonable license compatibility.