ComPDFKit
ComPDFKit enable developers to integrate PDF Annotations and Format Conversion, Digital Signature, Smart Forms, OCR, Redaction, and more in to their applications on Windows, macOS, iOS, Android, and the web through their PDF SDKs. Their aim is to offer the most comprehensive library to shorten the project development cycle and to continuously improve their SDK products to meet developer's future requirements as they change and projects evolve.
SAPIEN Technologies
SAPIEN Technologies makes Windows administrative tasks simpler. With more than 20 years of experience, best-in-class software applications, authoritative books, supportive communities, and real-world training SAPIEN offers everything you need to learn new technologies, advance your skills in existing technologies, and work more effectively and more efficiently.
PDFlib
PDFlib GmbH is completely focused on PDF technology. Customers worldwide use PDFlib products since 1997. The company closely follows development and market trends, such as ISO standards for PDF. PDFlib GmbH products are distributed in more than 100 countries all over the world with major markets in North America, Europe, and Japan.