PaperScan - PaperScan Scanner Software is a powerful TWAIN & WIA scanning application centered on one idea: making document acquisition an unparalleled easy task for anyone.
Tesseract - Tesseract is an optical character recognition engine for various operating systems
Pocket Scanner - Pocket Scanner is the best app for quickly scanning documents to JPEGs or multi-page PDFs.
ABBYY FineReader - ABBYY's latest PDF editor software, FineReader 16 you can easily convert files like PDF to Excel, PDF to Word, edit, share, collaborate & more with this PDF editor!
Scandoc - Scandoc is an advanced pdf scanner application that helps to scan documents from a mobile camera, store pdf with watermarks or signatures across smartphones and tablets.
Onlineocr.net - Free Online OCR service allows you to convert PDF document to MS Word file, scanned images to editable text formats and extract text from JPEG/TIFF/BMP files