GroupDocs
GroupDocs creates easy to use, comprehensive online document management APIs for .NET, Java and Cloud, as well as a range of Cloud apps that improve document collaboration for organizations of any size. GroupDocs saves developers and end users time and money by offering a complete and powerful set of document management APIs allowing users to view, sign, annotate, compare, convert and assemble documents in a wide variety of formats, including Microsoft Word, Excel, PowerPoint and Visio, as well as Adobe Acrobat PDF and many image formats. Flexible workflows and easy-to-use, customizable user interfaces are part of the package.
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.