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Apache PDFBox - The Apache PDFBox™ library is an open source Java tool for working with PDF documents.
DocuPUB - DocuPUB is an online file converter, file merger, file compressor, and file resizing tool.
iTextPDF - iText offers flexible tools for PDF creation, editing and inspection.
PDF Joiner - This online tool allows you to join several PDF documents into a single file, free of charge.
IronPDF - SDK for creating and editing PDFs.
7-PDF Split & Merge - Functions: Split pdf-files, Merge pdf-files together