Is it possible to replace the default OS X window manager?

About the question, ive heard you can install KDE but it is too buggy. About the behavior of the green button. It annoys me too. But fourtunately there is a little piece of software for that: Rightzoom .Just be sure to add it your default startup applications so that it starts at login :)

Your question prompted me to do some looking around for myself. Afloat looks like it will give you the behaviour you want. (I haven’t tried it out yet myself, though).

“behaviour”?! (I’ve been reading too many English blogs, apparently).