WriteNext - The writing application that boosts your writing. Increase focus and writing performance and reduce distractions by separating your creative writing from other activities. Let writing be the only activity you perform in the writing application.
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.
Calmly Writer - Distraction-free text editor for Mac, Windows, Linux and ChromeOS.
Desk - An award-winning & beloved desktop publishing client, exclusively for OS X.
Stashany - Online notepad for developers
BlogDesk - Blogging should be simple, but it gets complicated and time-consuming if you are serious about it.