Thanks - I've actually tried grammarly and found them to be ok, but even after submitting to their paid service it didn't improve my document much. I'm not concerned about plagiarism so I don't value that feature. I write a lot academically and unfortunately humans are still the way to go. The outfit I'm currently trying is editmypaper.ca but I'm really looking to cut costs and find something more automated. I'm also concerned that some of the free ones are storing/using my documents elsewhere. Language tool is interesting and I like it more than grammarly (also like how it's EU funded and open source, if you know what you're doing which I don't), but it still isn't great. I think IBM (Watson) or similar will come out with a better AI based checker. In the mean time I've also been using gmail.com by pasting in my text and it has a nifty click to correct type of checker. Thanks for your suggestions though.
