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
PDFChef Merge PDF - PDFChef Merge PDF is an online tool that allows you to merge multiple PDf files into one quickly and securely.
PDF Merge Split Free - PDF Merge Split for Mac. Free Mac application to merge and split PDF files on Mac OS X.
PDFill - Open, View, Edit, Save and Print PDF Documents without Adobe Acrobat
PDF Arranger - Small python-gtk application, which helps the user to merge or split pdf documents and rotate, crop...