Tesseract - Tesseract is an optical character recognition engine for various operating systems
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
GOCR - GOCR homepage. GOCR is an OCR (Optical Character Recognition) program, developed under the GNU Public License.
Adobe Scan - Scan anything into a PDF using your mobile device.
Prizmo - Prizmo is a scanning application for Mac with Optical Character Recognition (OCR) in over 40 languages with powerful editing capability, text-to-speech, and iCloud support.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.