FCell: Numerical Development in Excel w/ F# Are your Excel Add-Ins difficult to develop, test and deploy? Frustrated with C++, VSTO or VBA based solutions? Or maybe you would simply love to run interactive F# scripts within Excel? Come and learn about FCell Add-In, an integrated F# development platform embedded in Excel. Using Fmat, an open source F# math library, we will implement simple numerical models in Excel. You will learn how to create Excel User Defined Functions in F# and how to access spreadsheet data in your F# scripts via Excel Type Provider for Named Ranges. Only Excel 2007 or later required.