PanWriter: Distraction-free writing tool
PanWriter isn't all that small, but it's simple, clean, and does the bare minimum over a plain text editor.
If you are a programmer there is an almost embarrassing abundance of text editors, from crusty old things from the 1970s that require you to actively cultivate Stockholm Syndrome, to sophisticated modern efforts that try to type your code for you. There are fewer choices if what you write is intended for humans, rather than computers, to read.
Of course, there are word processors, although Microsoft Word has killed most of them off by now. Its single most valuable tool, Outline View, is now a niche feature that the freebie web and Android versions don't bother to include. There's always WordPerfect, the killer app that won't die, if you have the time to learn its UI. LibreOffice is very handy, but also doesn't implement the outliner.
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Without bloating the app with extra features, the one thing we'd like to see is an integrated wordcount, but otherwise, even at the current version 0.8.4, PanWriter is close to perfect