You can check languagetool. I believe there is a selfhost version as well, I even recall a cracked selfhost version. I am a premium subscriber of the original app at the moment, I understand it is not 100% privacy tight.
You can check languagetool. I believe there is a selfhost version as well, I even recall a cracked selfhost version. I am a premium subscriber of the original app at the moment, I understand it is not 100% privacy tight.