Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.
Google Lens - Discover information about something by taking a photo
PDF-XChange Editor - The smallest, fastest, most feature-rich PDF editor/viewer available
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
ScanTailor - Scan Tailor is an interactive post-processing tool for scanned pages.
OpenScan - FOSS Document Scanner