QuickMark - QuickMark makes everything possible.
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
Barcode & QR Code Scanner - A free app which allow to read and generate barcodes for Android.
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
ZXing - Barcode Scanner for Android
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.