A library provides Delphi implementation (source included) for a complex Fast Fourier Transform (FFT) on an arbitrary length data series. [Open source, MPL]

by SiComponents. It will change language of user interface immediately on request. TsiLang allows to see translated interface in design-time.

Delphi spreadsheet component.

An advanced DBGrid component (TXDBGrid), and QuickReport VCL Grid control (TXQRGrid) for Delphi and C++ Builder.

Provides reviews of a selection of the best freeware components available for Delphi today.

A form sizing component that automatically sizes your forms to fit any screen resolution.

Scientific and engineering software components for Delphi and C++ Builder. [Commercial]

A component based rapid OPC application development framework for Borland Delphi and C++Builder. enables drag and drop configuration of data flow from OPC Servers to databases and GUI. [Commercial]

Components for Delphi programmers in DAO, ADO , CDO and other fields.

CD / DVD Burning related components for Delphi and C++ Builder from Binary Magic.