ApowerPDF - ApowerPDF is a versatile PDF editor which also features as PDF converter, viewer, creator and more. It provides a perfect solution for all users.
Apache PDFBox - The Apache PDFBox™ library is an open source Java tool for working with PDF documents.
Icecream Apps PDF Editor - Excellent powerful tool to edit PDF, annotate PDF, redact, protect and more.
iTextPDF - iText offers flexible tools for PDF creation, editing and inspection.
Classic PDF Editor - View, Create, Convert and Edit PDF Files
IronPDF - SDK for creating and editing PDFs.