PDF Joiner - This online tool allows you to join several PDF documents into a single file, free of charge.
Adobe Acrobat DC - Make your job easier with Adobe Acrobat DC, the trusted PDF creator. Use Acrobat to convert, edit and sign PDF files at your desk or on the go.
PDFTK Builder - PDFTK Builder is a free graphical interface to for PDFTK, making it much easier to use.
Wondershare PDFelement - All-in-one PDF editor
PDFChef Merge PDF - PDFChef Merge PDF is an online tool that allows you to merge multiple PDf files into one quickly and securely.
Microsoft Word - Microsoft Word is a commercial word document processor for Windows.