Boxoft Screen OCR

capture screen and convert screen text into editable electronic text
OCR in .Net

ironocr is an advanced ocr library for .net developers to use in c# and vb.net

extremely accurate ocr engine with an i/f program (in vb5 source code included)
CrystalOCR

CrystalOCR is a high-quality royalty-free OCR engine
Text-R

simply recognize text in pdf and image files.

Open edit save RTF PDF DOC DOCX ODT format files, Scan Images for OCR and ICR