Writer is the coolest, fastest, distraction-free writing app around. No fonts, no bold, no italics—just you and your words.
Writer, the Internet Typewriter
This is basically an online text editor, but the paid tier has the ability to sync to Dropbox, (which I like.) I think I’m going to start using this for journaling, because there was a journaling webservice that let you sync to dropbox a while ago but it no longer exists.