MapWindow ActiveX Control

The core MapWindow component is the ActiveX control, “MapWinGIS.ocx”. This is an programming object that can be added to a form in Visual Basic, Delphi, or other languages that support ActiveX, providing a built-in GIS data map. We have tried to optimize it for use as a fully functional model interface, not just as a map viewer. This involved speeding up image and grid display, limiting the amount of redrawing that the user sees, and including application programmer interfaces (APIs) for low-level access to grid, shape, table and image data.

Source: http://www.mapwindow.org/