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!
Beyond Compare - Beyond Compare allows you to compare files and folders.
Tesseract - Tesseract is an optical character recognition engine for various operating systems
WinMerge - WinMerge is an open source differencing and merging tool for Windows.
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
Meld - What is Meld? Meld is a visual diff and merge tool targeted at developers.