I have used Divvy in the past, but now use Keyboard Maestro for window management. (http://www.keyboardmaestro.com/)

You do have to configure things and set them up a bit, but it can do SO much more than just window management.

Just throwing another option out there…For me, Keyboard Maestro is one of those must-have programs like Alfred or Hazel—totally changes how you do things.