You could have downloaded DataFitX 2.0 from our software library for free. This program is a product of Oakdale Engineering. The following version: 2.0 was the most frequently downloaded one by the program users. The program belongs to Development Tools.
From the developer:
DataFitX is a COM component (in-process ActiveX DLL) which allows you to add a powerful nonlinear regression (curve fitting) engine to your software with just a few simple lines of code. DataFitX is developed using COM, so it can be used in any environment that supports COM, including Microsoft Visual Basic, Microsoft Visual C++, Delphi and VBA (Microsoft Excel, Microsoft Access or any VBA enabled client).
You may want to check out more software, such as Advantage TDataSet Descendant for Delphi/C++Builder, conaito PPT2Flash SDK or Liquid XML Data Binder 2008, which might be similar to DataFitX.