I have been using a Mac-only software called Grammarian that checks grammar, spelling, and punctuation, whether I am typing it into the forum, Facebook, the Aviva Directory, a text editor, or a word processing program. I didn't think I'd need such a thing because my grammar, spelling, and punctuation isn't so bad, but I have found that it does improve my writing. The job it does catching typos alone would make it worth it. It is particularly valuable at work. While it doesn't so much matter whether my grammar, spelling, and punctuation are less than perfect here or on Facebook, I like to do better when I'm being paid for it. When I am working on the directory, my category descriptions are limited to 5,000 characters so if I run over, I have to look for things that I can cut in the text, and that's where the errors often find their way in. Grammarian not only catches the errors quite satisfactorily, but it offers suggestions and will make the correction if I decide to go with its suggestions, as I often do. Most words are already in its database, and I can add others that I might come across, or simply direct it to ignore errors that I have used intentionally.