Adolix Split and Merge PDF
Full user review
"Handy application. Free version has limits."
Quickly merges or splits PDF documents.
Not free. More like a free trial. It can only combine 5 files at a time. The number of pages it can split are also limited.
Great find for those who only need to merge or split a few small documents. Not sure if the full version would be worth the money given limited functionality.