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Finaquant Calcs is a commercial .NET library with (1) table-valued functions (Table Functions) and (2) Calculation Nodes and Networks (Calculation Engine). This free 30-day evaluation version comes with restricted table size (max 5000 rows). You may buy a permanent license with unlimited table...
Table Valued Functions in Excel
Open-source Excel add-in in C#/.NET4.0 that makes matrix, vector and most importantly, table-valued functions of Finaquant Calcs available for Excel users and programmers. Based on ExcelDNA and NetOffice
Finaquant Protos is a non-commercial and free .NET library with table-valued functions (Table Functions). This .NET library can only be used for non-commercial purposes like education and science. Please see Finaquant Calcs with additional features and unlimited table size for commercial use.