Tesseract - Tesseract is an optical character recognition engine for various operating systems
Chessvision.ai - Analyze chess position from any website, image or video.
Chessify.me - No 1 cloud service for chess engine analysis. Join Anish Giri, Levon Aronian, & 100s of other pro chess players to analyze with up to 1,000 MN/s speed cloud engines.
ABBYY Cloud OCR SDK - Highly-accurate ABBYY Cloud OCR SDK is available for everyone in a cloud through web API.
Free-OCR.com - Free-OCR.com is a free online OCR (Optical Character Recognition) tool.
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