Tesseract - Tesseract is an optical character recognition engine for various operating systems
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 .
Chessvision.ai - Analyze chess position from any website, image or video.
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.
ABBYY Cloud OCR SDK - Highly-accurate ABBYY Cloud OCR SDK is available for everyone in a cloud through web API.
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