TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
OpenScan - FOSS Document Scanner
Yandex.Images - search for images on the internet, search by image
SmartLens - Identify and learn about any object, instantly, using AI
Google Images - Google Images is a search service owned by Google that allows users to search the World Wide Web for image content.