I searched the forum for working integrations of LT with Ckeditor or TinyMCE but all that I see is years old code for outdated versions of Ckeditor / TinyMCE. Am I right in my assumption that there is no active development for integrations of languagetool with WYSIWYG HTML javascript editors? I wouldn’t want to invest my time to try to get to run things that are outdated and have no future.
I’m not aware of any up-to-date integrations from the community. If you’re interested in a commercial product, we offer a Javascript snippet which you can add to your page. It will integrate with almost all editors, including CKeditor. If you’re interested, you can contact our support about it.