From Pro Barcode:
PDFMix is the most comprehensive PDF after-creation tool available. The original document is long gone but the PDF created from it is still around and in need of a make-over. With PDFMix you can rearrange pages in a PDF document. Add pages to a PDF document that come from another document. Remove pages from a PDF document. Extract a selection of pages from a PDF document and export them as a new document. Split a PDF document in chunks for easier handling.
Merge content from two or more PDF documents. Insert blank pages into a PDF document. Rotate pages in a PDF document. Change document attributes like author, title or encryption. Application works stand-alone, no Adobe Acrobat required.