A great place to find textbooks and instructional videos for programming languages.
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A survey of popular tools and resources grouped by general task associated with the Digital Humanities, including workflow management, understanding fair use, design, and specific apps for specific activities
Tesseract is the standard open source software for OCR. Works with over 100 languages by default and can be trained on new languages as well as to improve accuracy. Good documentation, but requires working on the command line (the project page does link to a list of programs/apps for Tesseract with a user interface).