Personally I find Magnet[1] (for Mac) to be wonderful, it moves your windows around to halves, thirds, and two-thirds presets with either dragging or keyboard s

Personally I find Magnet[1] (for Mac) to be wonderful, it moves your windows around to halves, thirds, and two-thirds presets with either dragging or keyboard shortcuts. [1]: http://magnet.crowdcafe.com http://magnet.crowdcafe.com