Tesseract - Tesseract is an optical character recognition engine for various operating systems
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
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!
OCR.space - The OCR.
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
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 .