Google Lens - Discover information about something by taking a photo
Capture2text - Capture2Text enables users to quickly OCR a portion of the screen using a keyboard shortcut.
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
TextSniper - Instantly extract any text from your Mac's screen
OpenScan - FOSS Document Scanner
dpScreenOCR - Program to recognize text on screen