I use iA writer for most of the actual work. It’s simple, minimalist and fun to use. I’ve been on it for a while now. Sure, there may be better apps, but this one works pretty well for me. For Windows users, try Writemonkey.
How To Publish 6 Blog Posts Every Week.
Jon Westenberg

I would also humbly suggest something that took me a while to find, but works well.

It’s simple, plain text, and syncs through the SimpleNote platform. I’ve yet to encounter an issue with it. It’s just simple enough to encourage writing, and remove creative barriers.