Apple Preview is the OS X program used for opening and editing PDFs.

Alternative apps

Combine PDFs
Combine PDFs
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Tool that allows you merge multiple PDFs into a single, new document.

Foxit Reader
Foxit Reader
FREE
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Open, edit, and print any PDF documents on your Mac.

pdfoo
pdfoo
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Valuable content in your PDFs is now just a click away.

Bluebeam Revu Mac
Bluebeam Revu Mac
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Professional PDF editor for Mac OS.

Suck It Down
Suck It Down
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Content is king on the Internet and Suck It Down helps you get it faster.