OpenOffice Writer
like Word but ***king better. It has a way easier UI for me to utilize along with adjustment of screen paper color vs coloring the paper or anything like that. It's super easy to adjust the page as much as I need to, whereas Word's changed UI is a nightmare to find anything - stuff still exists, but it's hard to find things like how to access the stupid Font-Superscript option just.. URGH. Or page numbers or footnotes - soooo much easier in OpenOffice Writer.
Also I loathe google docs. It's.... fine... Just lags loading, has a cap, and messes with all of my formats soooo much @_@ Just drives me crazy.
If you want to just sit and write and not have any other options - "zenwriter" is fantastic tool!