Capture2text - Capture2Text enables users to quickly OCR a portion of the screen using a keyboard shortcut.
Sumatra PDF - Sumatra PDF is a slim PDF/DjVu/EPUB/XPS/CHM/CBR/CBZ/MOBI viewer for Windows.
TextSniper - Instantly extract any text from your Mac's screen
Foxit Reader - Foxit Reader is a free and light-weight multi-platform PDF document viewer.
dpScreenOCR - Program to recognize text on screen
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.