I was able to turn off everything except the spell checker, but I’d rather write my own from scratch, though just spell checking works for now. I have a number of projects and I’d be at least a year before I could turn my full attention to this. The only caveat is that I did it for the en-US language only (UPDATE: possibly all languages now, I just have no easy way to check). But, it would be simple enough to add another language (not me, but whomever might be interested). I may make some additional tweaks (though enabling only spell checking clears up a lot of problems), but that’ll be here and there. I’d like to clean up the parser so grammar works better, but that would require more time.
If anyone is interested, let me know. The biggest problem I have with the LanguageTool Proofreading code itself is its licensing. I’m all for open source, but I don’t (nor will I ever) deal with GNU (GPL)! If it was licensed Apache, MIT, or any of the less restrictive licenses, I’d be more willing to turn my attention to it.