Just as a how I stumbled into this:
Procrastinating from my thesis writing I thought I could setup coala for it so just get all the natural language bears into a file and go.
WriteGoodLintBear and AlexBear need a npm package which I had to look for via google, LanguageToolBear needs language tools, again no link in docs, ProseLintBear workt after a pip install but had to look that up too myself.
The language setting for LanguageToolBear is not documented as i have to guess how to tell him what language I need (it needs eng-us for example but wont understand english, ger or german)
after that, LanguageToolBear still does not yield errors for wrong words :/