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.
Investintech
Investintech.com Inc. is a Canadian company incorporated in 2000, who are the developer and publisher of their own proprietary PDF technology. It's used in desktop, server and developer products worldwide. Millions in over 150 countries have used their flagship PDF product Able2Extract. As a company, they are focused on providing business and consumer customers with products that are easy to use and that deliver powerful results. All the products are built by in-house software development teams headquartered in Toronto, Canada and in Investintech's European office.
Advanced Software Engineering
Advanced Software Engineering was founded in 1995 by several software developers who believed that the key to improving programmer productivity is to have good reusable software components.
Since its foundation, Advanced Software Engineering has been developing software components and libraries for major vendors and corporations. Their areas of expertise are system and network management, network security, and web based user interface.