GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
OpenScan - FOSS Document Scanner
SmartLens - Identify and learn about any object, instantly, using AI
PimEyes - Search by face image and find given person with information where this person appear online. PimEyes analyzes over 50 million websites to provide the most accurate search results.
Adobe Scan - Scan anything into a PDF using your mobile device.