Tesseract - Tesseract is an optical character recognition engine for various operating systems
PDFify - PDF creation with text recognition and scanner support. Features email and webpage import to PDF.
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!
KDAN Mobile PDF Reader - PDF Reader is the one app you can rely on when you need a portable solution to work with PDFs.
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
Anvil PDF Filling API - The easiest way to programmatically populate any PDF