There’s a new version of the LanguageTool add-in for SDL Trados Studio. It works with version 2017 and 2019. While the previous versions required you to install Java and LT locally, it’s now easy to try it without.
There’s a quick start guide at http://www.posteditacat.xyz/download/languagetool-plugin-for-sdl-trados-studio-quick-start-guide/
Get more screenshots on the appstore:
Thanks to @DArek for developing the add-on.