https://languagetool.org/ for one supports running your own instance of the server-side portion out-of-the-box. You could run it truly locally assuming your device is appropriate, or your own server which might be more flexible as you can support a greater range of devices and share custom dictionaries between them.
Gives me a "privacy policy", "continue and don't ask again" or "cancel" hyperlink, nothing else. If I want to use it the first time.
But if you open the extension options under the "more tools" > extensions tab you can set the LanguageTool API server URL[0].
Going to try to setup a server over the weekend, thanks.
Yes... But your browser won't detect "spellcheck do can browser your"
Grammar is more than just spelling.
Trying I promise, even different languages. But I'm not a native speaker and a bit dyslexic.
So someone or thing looking over my shoulder would be nice.