I run languagetool locally, and it’s actually really good, but the browser extension is closed source even though I can point it at a local server, I don’t know if it’s logging what I type.

But libreoffice has built in support, which is great.

I’m aware but I don’t care too much lol. It’s helped me quite a bit and you don’t want to see the alternative. I have enough trouble expressing myself, I’ll take the help as I can get it.