Windows/Mac/Linux (All platforms): Join PDFs together, split them apart and pull out individual pages with pdfsam, an open-source, Java-based cross-platform tool that's a free download. The program, just released in a 1.0 alpha, does basic PDF manipulation pretty quickly, and job processes can be saved for common tasks. As with the OS X-native Combine PDFs, it's a handy tool to tuck away for when you need it, like pulling relevant chapters out of a manual or textbook. Pdfsam is a free download and works wherever Java can, but a Windows installation tool is available.
Split and Merge PDFS with PDFSam
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