A Good Word Processor

Hey, I was hoping anybody out there could tell me if they've heard of any simple, reputable word processing programs _besides_ Microsoft Word that are simple to use and still contain many essential features to writing papers easily, such as double spacing, margins, text formatting, headers and footers, etc.

I know I'm going to get a bunch of internet-first-timers suggesting Microsoft Word to me, so let me repeat: "besides Microsoft Word."  I do not have Microsoft Word and I do not want to go looking for it.  I also do not want some shoddy program that a team of goofballs is actually charging money for.  Above all, it must be freely downloadable.  No childish demos.  No crybaby cracks.  No immature trial versions.  Full program.  Full features.  Fully (and quickly) downloadable.  

Thanks in advance.