Organizing windows around your desktop is something that breaks you down from your main task. For Mac OS, I used to recommend 2up, which allowed people to make windows use half-screens (right, left, top or bottom).
However it has been discontinued, and I have found a better replacement which has the initial advantage of being opensource: Shift It (a fork of the initial project) allows you to also use quarters of screens, fullscreen and center.
I use this daily, mainly with terminal windows or with documents and editors, for having more than one window at the same time, and still maximize the used screen estate, without having to drag and move windows with the mouse.
I highly suggest it, and I am making available a pre-compiled version of the lastest commit, which has multi-monitor support.