Tesseract - Tesseract is an optical character recognition engine for various operating systems
Klippa - Invoice and receipt processing for retail businesses
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
Mindee - Extract any data point, from any document, in a second
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.
MicroBlink - Real time text recognition for your mobile apps.