PDFTK Builder - PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use.
RoxyApps PDF Merge Tool - Merge multiple files of different formats in a single PDF file
PDF Arranger - Small python-gtk application, which helps the user to merge or split pdf documents and rotate, crop...
PDFMerge - PDF Split and Merge tool is implemented using the PdfSharp library and is either GUI or command...
Debenu PDF Tools - Simple to use solution to merge PDF files, edit document properties, add and edit custom metadata, convert images to PDF, convert PDF to text and much more.
PDFMate Free PDF Merger - PDFMate Free PDF Merger works as a PDF Joiner, PDF combiner, PDF breaker, image to PDF converter and PDF encryptor. With PDF Merger, you can batch merging pdf files, combining specified pages or converting scanned image file to create new PDF file.