Tesseract is an Open Source OCR engine, available under the Apache 2.0
license. It can be used directly, or (for programmers) using an API. It
supports a wide variety of languages.
Tesseract doesn't have a built-in GUI, but there are several available from the
$ alias tesseract='docker run --rm -v `pwd`:/work -w /work vimagick/tesseract' $ tesseract myscan.png out $ cat out.txt