PDFtk!

PDFsam Basic is a free, open source, multi-platform software designed to:

PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use. It is a easy to use tool to collate (merge), split, encrypt, decrypt, stamp and rotate (only 90°, 180° or 270°) pdf documents. Portable Version: http://portableapps.com/apps/office/pdftk_builder_portable .

PDF-Shuffler is a small python-gtk application, which helps the user to merge or split pdf documents and rotate, crop and rearrange their pages using an interactive and intuitive graphical interface. It is a frontend for python-pyPdf.

You can reorder, rotate, and remove pages, export images from a document, edit the title, subject, author, and keywords, and combine documents via drag and drop.

It could have been called something like pdf-to-pdf. It also provides many useful capabilities to developers of PDF-producing software or for people who just want to look at the innards of a PDF file to learn more about how they work.

UnityPDF lets you merge, split, divide, rotate, protect PDF files and more. All features are easy to use and do not require complex skills.

Edit, convert, annotate, protect, merge, split, compress, and sign PDF files on Mac.

Tool to edit PDF metadata, bookmarks, viewer preferences, ...

Functions: Split pdf-files, Merge pdf-files together, Compose new PDF-Files while using individual sorting, customized patterns (similar to Word printing), etc. You can even append encrypted PDF files to another PDF document Faster than Java based PDF Split & Merge Tools Can be used on USB-Sticks as PortableApp PDF Split & Merge Tool Support for English and German is included.

FoxyUtils is a complete suite of PDF web apps.

With PDF Stapler you can merge pdf files and order them into one output file.

Text To PDF is a free application that allows users to convert plain text files to PDF documents. You can easily and directly convert text files to PDF without the need of any Adobe application or third party software. Depending on your needs or requirements, you can set the settings of the file before the conversion. This application is 100% free.

PDFresizer is a set of free, simple online tools for manipulations with .pdf files. You can resize, rotate, split, merge, optimize, and convert PDFs.

Whether you’re an independent publisher, author, big name publisher, or a company with important information, you need to brand your documents with a watermark. With PDF Watermark, you can do just that. Add a watermark to your documents easily, whether they’re an image, logo, signature, url, and more! PDF Watermark supports transparent watermarks and even allows you to rotate your watermark from any angle.