OCR

Available OCR (Optical Character Recognition) packages for Termux available on-the-fly are:

Package: ocrad 

Description: Optical Character Recognition program based on a feature extraction method  Homepage:http://www.gnu.org/software/ocrad/ocrad.html

Package: ocrad-dev 

Description: Development files for ocrad  Homepage:http://www.gnu.org/software/ocrad/ocrad.html

Package: tesseract 

Description: Tesseract is probably the most accurate open source OCR engine available  Homepage: https://github.com/tesseract-ocr/tesseract

Package: tesseract-dev 

Description: Development files for tesseract  Homepage: https://github.com/tesseract-ocr/tesseract

There probably are more OCR programs available as Ruby gems, Python pips, Perl cpan and similar.