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.
BlogDesk - Blogging should be simple, but it gets complicated and time-consuming if you are serious about it.
Stashany - Online notepad for developers
Open Live Writer - Open Live Writer makes it easy to write, preview, and post to your blog.