yWriter - novel writing software
yWriter is a word processor which breaks your novel into chapters and scenes, helping you keep track of your work while leaving your mind free to create. It will not write your novel for you, suggest plot ideas or perform creative tasks of any kind. http://www.spacejock.com/yWriter6.html
And I'm pleased to say that it is now available cross-platform on PC and Android - http://www.spacejock.com/yWriterAndroid.html
I'd love to hear from anyone else using yWriter what they think of it and in particular the Android beta version.