CutePDF - CutePDF is a simple but entirely powerful PDF files creator, converter, and virtual printer.
Apache PDFBox - The Apache PDFBox™ library is an open source Java tool for working with PDF documents.
FoxIt - FoxIt offers solutions to read and edit PDFs from PCs or mobiles.
iTextPDF - iText offers flexible tools for PDF creation, editing and inspection.
Kdan PDF SDK - Kdan PDF SDK is a universal mobile library for developers who want to render, manipulate and annotate PDF files in their iOS, Android device
IronPDF - SDK for creating and editing PDFs.