Slate

You hold a key, speak, and let go. Your words are typed wherever your cursor is, in any app.

It tidies what you say without changing it. It takes out “um” and “uh”, and if you correct yourself mid-sentence, it keeps only the correction. Say “new paragraph” and it starts one. You can turn any of this off.

There is no subscription, and nothing you say leaves your Mac.

I built all of it myself.

One problem: Slate updates itself. Before the first release, I found a mistake in how I had packaged the update. If it had gone out, every copy of Slate would have stopped accepting updates, and I could not have fixed it from my side. I caught it by checking the release by hand, and that check is now a step in every release.