SauceNAO - SauceNAO is a reverse image search engine.
TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
Yandex.Images - search for images on the internet, search by image
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
DOTKey - 21st century typing for 21st century devices
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.