PDF Scissors - Crop pdf. Drop margin, whitespace. Auto crop all pages. Easy feature to make nice cropped pdf for ebook readers such as Amazon Kindle, Sony, Cybook etc.
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
Briss - Cross-platform application for cropping PDF files in a simple and fast way via a GUI.
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
PDF-XChange Editor - The smallest, fastest, most feature-rich PDF editor/viewer available
Microsoft Lens - Microsoft Lens (formerly known as Office Lens) is an all-in-one application designed for Windows, Android, and Apple devices, allowing you to capture important information from signs, PDFs, whiteboards, and more to add.