TinEye - Reverse Image Search to help find an image's source, duplicates or altered versions.
Tesseract - Tesseract is an optical character recognition engine for various operating systems
GImageReader - gImageReader is a simple Gtk/Qt front-end to the Tesseract OCR Engine.
Onlineocr.net - Free Online OCR service allows you to convert PDF document to MS Word file, scanned images to editable text formats and extract text from JPEG/TIFF/BMP files
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.
Prizmo - Prizmo is a scanning application for Mac with Optical Character Recognition (OCR) in over 40 languages with powerful editing capability, text-to-speech, and iCloud support.