[ht_th]

I am using LanguageTool. Not the website, but a command-line tool. You can configure it with all sorts of rules to check all sorts of spelling, grammar, style, and language issues. However, as far as I have noticed, LanguageTool is not a very advanced language-help tool. Still, it did improve my writing a lot. If nothing else, my writing has gotten more consistent.

[nxpnsv]

The cli from here? https://github.com/languagetool-org/languagetool

[ht_th]

Yes. You can build the command-line application Java Jar from that repo. I also combine it with vim (https://github.com/dpelle/vim-LanguageTool).