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Tesseract - Tesseract is an optical character recognition engine for various operating systems
CopyFish - Copy, paste and translate text from any image, video or PDF.
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
OpenScan - FOSS Document Scanner
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!
FreeOCR - Scanning OCR Software. Latest release: March 2015 v5. 4. Totally free OCR software for Microsoft Windows. Import Directly from Twain scanners, PDF and popular image formats .