What are some alternatives?
When comparing mergepdf.net and PDFsam, you can also consider the following products
Merge PDF - Merge PDF is a user friendly PDF Reader.
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.
RoxyApps PDF Merge Tool - Merge multiple files of different formats in a single PDF file
PDFill - Open, View, Edit, Save and Print PDF Documents without Adobe Acrobat
PDFMerge - PDF Split and Merge tool is implemented using the PdfSharp library and is either GUI or command...
PDF-Shuffler - PDF-Shuffler is a small python-gtk application, which helps the user to merge or split pdf...