I'm a Final Draft man. Used to use Word, but such a drag to have a character name dangling at the bottom of the page with the dialogue on the next. Always had to do a final check through to make sure, then, if I made any changes, it would throw the pagination off. Drove me to drink. Not that I really needed such a strong reason to drink...
Can't really speak to the Freeware option, except to say, (affecting his best Leonard "Bones" McCoy) for God's sake Man (or woman), we spend money on all kinds of crazy stuff for ourselves, what better thing to spend your hard earned dollar on than your future career? Invest in your hopes and dreams. You're a writer, not a bricklayer!