PDFsam
Freemium
PDFsam Basic extremely useful tool for splitting and merging PDFs in a configuration that suits you.
Skim
Open Source
Skim is a PDF reader and note-taker for OS X. It is designed to help you read and annotate scientific papers in PDF.
Adobe Acrobat DC
Commercial
Adobe Acrobat Reader DC is the industry standard for viewing, printing, signing and commenting on PDF documents.
Master PDF Editor
Freemium
Master PDF Editor is а complete application for editing PDF documents and PDF files for Mac OS X, Windows and Linux.
Compare Nitro Pro with alternatives
Compare Adobe Acrobat DC and Nitro Pro and decide which is most suitable for you.
Compare Master PDF Editor and Nitro Pro and decide which is most suitable for you.