Simple PDF can merge several PDF documents into one file. It has some additional options that make it interesting.
Merging: Simple PDF allows users to merge several PDF files into one file. To do this, they just have to add the desired PDF documents, then, click on "Merge" and the utility does the rest.
Viewer: this simple application can be used as a PDF viewer. Over and above, it can also be used as ePub, Mobi, CHM, XPS, DJVu and other formats that may be hard to view with other tools. Comic books and e-books are also supported.
PDF splitter: Simple PDF is featured with another function that is to split PDF files. This means that users can split a PDF file into several files. The process can be done easily and in a matter of minutes.
Pdftk, the toolbox for PDF files is included in the download.
This tool does not interfere with other applications running on the computer.
This software is totally downloadable free of charge.