Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
Scanbot - Scanbot is a mobile app that allows you to use your device's camera as a document scanner. The app is capable of scanning a large number of source materials, and it can handle QR codes as well.
Capture2text - Capture2Text enables users to quickly OCR a portion of the screen using a keyboard shortcut.
Office Lens - Download this app from Microsoft Store for Windows 10, Windows 10 Mobile, Windows Phone 8. 1, Windows Phone 8, Windows 10 Team (Surface Hub), HoloLens. See screenshots, read the latest customer reviews, and compare ratings for Office Lens.
ksnip - Ksnip is a Qt based cross-platform screenshot tool that provides many annotation features for your screenshots. - DamirPorobic/ksnip
Scanner Pro - Scanner Pro turns your iPhone into portable scanner in your pocket.