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PDF Joiner - This online tool allows you to join several PDF documents into a single file, free of charge.
PDFsam - PDFsam Basic, a free, open source, multi-platform software designed to split, merge, extract pages, mix and rotate PDF files
DocuPUB - DocuPUB is an online file converter, file merger, file compressor, and file resizing tool.
Haihaisoft PDF Reader - Haihaisoft PDF Reader is the name of a free to use PDF reader and printer that is extremely simple to launch.
PDFill - Open, View, Edit, Save and Print PDF Documents without Adobe Acrobat