The Umi-OCR plugin repository contains OCR engines and related components for Umi-OCR, with installation instructions and links to plugin releases.
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github.com
2ocr.com
2OCR is a free online OCR tool that converts images and PDF files into searchable PDF, PDF/A or text output. It accepts formats including jpg, png, tiff, bmp, heic, webp, pdf, doc and xls, requires no registration or email address, and supports multiple languages.
capture2text.sourceforge.net
Capture2Text is a free, GPL-licensed Windows utility that OCRs a portion of the screen using a keyboard shortcut and saves the resulting text to the clipboard by default. It supports Windows 7, 8/8.1 and 10 and packages several OCR languages, with additional language dictionaries installable.