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Take a look at language tool. It's pretty good in my experience. I'm not a native speaker, though.

(this post was not checked with languagetool)

Been a paying customer for about four years now, just renewed again today. It's been the best thing I've ever spent money on.

It also supports my language and it is pretty good at it.

For a while I just used code spell checker extension in VSCode. It does not do grammar but otherwise seems sufficient for me.

https://vale.sh is as close as I've found.

Nice ! Looks a lot like Alex from wooorm. Will check it out. Thank you !

You bet! I use it with this language server -- https://github.com/errata-ai/vale-ls -- to live-check text in my editor.

ChatGPT.

Neither local nor free?