From Inzone Software:
PDF Toolbox gives you total control over your PDF files for a fraction of the cost of more expensive solutions. With PDF Toolbox, you can perform the following powerful operations with only a few clicks:
Split, Merge and Append PDFs.
Does not require Adobe Acrobat software.
Add, remove and change PDF security.
Add, delete, edit and manage PDF bookmarks.
Stamp PDFs with custom Watermarks or other PDFs.
Add headers and footers to PDFs.
Add or modify PDFs meta-data.