1)   TextCaptureX 1.3
TextCaptureX is a COM library that allows screen text extraction in Windows applications. It is accessible from any COM aware programming languages.

 2)   TextGRAB SDK 2.1
TextGRAB SDK is a COM library for screen text capture, which can capture text from any part of any window. It's not an OCR solution. TextGRAB SDK can be used in different types of software like dictionaries,translators,organizers,etc