How old fashioned I feel, I am afraid I've only heard of Word, none of the other three. I'll be using LibreOffice Writer as I have a Linux machine. I'm also wondering how NaNoWriMo actually works - do we post what we've written somewhere - or that on the honour system too. I'm sure this is made known somewhere - but to be honest apart from signing up, I haven't looked at the NaNoWriMo site much.