If you’d like to contribute to LanguageTool and know some Javascript, here’s your chance: develop a Google Docs add-on. It’s not too difficult (basic version should be doable in 2 days) and has the chance to be used by tens of thousands of users: Develop Google Docs add-on · Issue #473 · languagetool-org/languagetool · GitHub. Please reply here or in the issue if you’re interested.