PDF Arranger - Small python-gtk application, which helps the user to merge or split pdf documents and rotate, crop...
DocuPUB - DocuPUB is an online file converter, file merger, file compressor, and file resizing tool.
PDF-XChange Editor - The smallest, fastest, most feature-rich PDF editor/viewer available
PDF Joiner - This online tool allows you to join several PDF documents into a single file, free of charge.
Master PDF Editor - Master PDF Editor is complete solution for editing PDF and XPS files.
Ultra PDF Merger - Ultra PDF Merger is a freeware PDF utility that joins your PDF files, or part of them, together.