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.
VectorDraw
VectorDraw is a provider of leading edge software development services that transform ideas into products. The company was founded in 1985 and its team consists of expert programmers in Vector Graphics and provides tools, support and programming to other Software Companies all over the world. VectorDraw helps software companies overcome staffing and resource challenges by providing a cost-effective way to extend its internal R&D staff. VectorDraw has the tools you need to easily create and manage your drawing projects. It offers a visual development environment that can be either graphical user interface (GUI) or code driven. It provides over 700 methods and properties and events. VectorDraw tools support UNICODE and are fully object oriented.
Jugaad
RadaeePDF SDK is a great PDF rendering and manipulation tool for developers. If you develop mobile or desktop applications the RadaeePDF SDK framework is the "Swiss Army knife" to handle PDF files. More than 6,000 applications are running the SDK on Android, iOS and Microsoft Windows UWP.