I know there is OpenOffice but that is even more cluttered than Word to me.
Here's a tip that I use though. I split up my chapters into different documents and keep a folder with the title of each story (or an identifying idea) with the chapter documents in it. It's a lot more organized and you can tell if your chapters are too short for a novel. Here's what it looks like in directory style.
My Documents (folder)
Story A (folder)
Chapter 1 *document*
Chapter 2
Story B (Folder)
Summary (I often do a synopsis for myself) *document*
Chapter 1 *document*
On the Moment (something I find myself doing, I like to go in order) *document*
It keeps it nice and organized, if you have a special header or font that you use on your stories, just copy it from the previous chapter (header or first word) and paste into your new chapter. Wa-la, your header and/or favorite font are there. Edit what you want (if you are using a header) and you can erase the word you used to get your font. It gets fairly easy with little hassle once you figure out how to do it. It's just automatic for me and it's so organized that it really helps and I never have to worry about a single document going over the two gigabyte limit or having a slow document load time.
If you are willing to spend the time to organize and the few seconds to keep it maintained, you will find youself much happier, more organized, and with slower wait times than to install a whole other software and spend the time importing all your individual parts of documents as chapters to write your novel.
Remember, organizing into folders for your stories will take you just as much time as it will to copy and paste into your new software that you took extra time to install and you won't even have to learn how to create a new chapter, just copy, new document, paste, edit, save. Done, how simple can that be?
Anyways, hope it helps and good luck finding a writer's software that will do what you want (especially a free one). Let me know if you find anything.
MattBatt