PDFsam
Freemium
PDFsam Basic extremely useful tool for splitting and merging PDFs in a configuration that suits you.
PDFTK Builder
Open Source
PDFtk is a simple tool for doing everyday things with PDF documents.
jPdf Tweak
Open Source
jPDF Tweak is a Java Swing application that can combine, split, rotate, reorder, watermark, encrypt, sign, and otherwise tweak PDF files.
Adobe Acrobat DC
Commercial
Adobe Acrobat Reader DC is the industry standard for viewing, printing, signing and commenting on PDF documents.
PDFill
Commercial
PDFill allows users to alter existing PDFs or create documents from scratch.
Compare PDF Chain with alternatives
Compare Adobe Acrobat DC and PDF Chain and decide which is most suitable for you.
Compare PDFTK Builder and PDF Chain and decide which is most suitable for you.
Compare jPdf Tweak and PDF Chain and decide which is most suitable for you.