While doing a bit of usual checking in and updating of my mac in the app store 2 weeks ago, I stumbled on a little app called "Magnet" that promised me some easier window management. Well, holy heck did it ever deliver!This little app moves your active window to specific x-y coordinates on your mac screen with a quick keyboard shortcut! It does everything in %, and uses 25%, 50% or full screen to divy up your screen. You can't customize the sizes or introduce more layouts, it essentially just does 4 quarters, 2 halves or full screen, but it's shown itself super useful so far!
Even if you don't use keyboard shortcuts, there's a little menu bar icon that let's you select where you'd like your window to go as well. It's well worth the $2.79 Canadian!
You can download it here!