LanguageTool needs someone who takes care of its marketing. Developers are usually not good at marketing, and they are busy with programming anyway. What would you do? Your task would simply be:
Make LanguageTool and its add-ons more popular.
How you do that is up to you. You could blog, improve our website, or create a long-term concept for marketing and then help making it reality. Like the developers, you won't get paid with money but with fame and a languagetool.org email address. You either have experience in marketing or are eager to learn. You should be able to regularly spend at least 2 hours per week on it. Who would like to take this job? Please reply here or to me personally (daniel.naber ..at.. languagetool.org).