AvisMap GIS Engine is a comprehensive SDK for the development of custom GIS applications and solutions. This SDK provides several ActiveX (OCX) controls which support Visual Basic, C#, Delphi, Visual C++ and other ActiveX compatible language.
The free AvisMap Viewer opens most GIS/CAD and raster image file types and most ArcView, ArcExplorer, and MapInfo projects. Besides just opening and viewing files, the Viewer supports an extensive list of features.