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Apache PDFBox - The Apache PDFBox™ library is an open source Java tool for working with PDF documents.
Apowersoft PDF Converter - Apowersoft PDF Converter is a safe and stable PDF converter, which can quickly convert PDF to Word, PPT, Excel, JPG, PNG and many more formats.
PortableSigner - PortableSigner is a signing (with X.509 certificates) program for PDF files.
Wide Angle PDF Converter - Convert PDF documents to Word, PowerPoint, Excel, JPG and other formats!
DocHub - Edit, send & sign PDFs online for free.
PDFManagerUltimate - Read, edit, and convert PDF files.