Tesseract - Tesseract is an optical character recognition engine for various operating systems
Quick License Manager - Quick License Manager (QLM) is a license protection framework that creates professional and secure license keys to protect software against piracy.
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
Labs64 NetLicensing - Monetize your digital products and services
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!
LicenseSpring - Reliable and easy to use License-As-A-Service (LaaS) for for any software application