TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
bcWebCam - Scan barcodes and QR Codes with your computer web cam
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.
Barcode to PC: Wi-Fi scanner - Turn your smartphone into a real barcode scanner