Tesseract - Tesseract is an optical character recognition engine for various operating systems
ShareX - ShareX is a free and open source program that lets you capture or record any area of your screen...
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
Greenshot - Greenshot is a free and open source screenshot tool that allows annotation and highlighting using the built-in image editor.
ABBYY FineReader - ABBYY's latest PDF editor software, FineReader 16 you can easily convert files like PDF to Excel, PDF to Word, edit, share, collaborate & more with this PDF editor!
LightShot - The fastest way to take a customizable screenshot.