GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
Elyse - The free version allows up to 30 tags.
Google Lens - Discover information about something by taking a photo
DEVONthink - DEVONtechnologies develops DEVONthink, DEVONagent, and other Mac and iOS apps for document and information management and web research.
OpenScan - FOSS Document Scanner
Leap - With Leap you find things based on your natural memory of that file.