MarsEdit - MarsEdit is a desktop blog editing application for the Mac. It provides an offline interface to most popular blogging systems. WordPress, Blogger, Tumblr, Movable Type, and many other systems are supported.
PDF Professional - PDF Professional is a feature-rich PDF Ultimate Solution for reading, annotating, form filling, editing, signing, and converting PDFs on your Mac, iPhone and iPad.
Desk - An award-winning & beloved desktop publishing client, exclusively for OS X.
Lunamaker - Lunamaker is a paper notebook with digital courses on drawing and sketching.
BlogDesk - Blogging should be simple, but it gets complicated and time-consuming if you are serious about it.
NimbleNotes - The digital notebook that helps you study.