Split Screen

I use a couple of better touch tool commands to just maximise two app windows to the left and right of the screen.

 

There is a tool called Cinch that makes windows snap to one half of the screen, similar to Windows 7. It works really well for me.

http://www.irradiatedsoftware.com/cinch/

 

+1 for cinch.

Another option that works similarly is SizeUp.

http://www.irradiatedsoftware.com/sizeup/

I use both and theyre great for window management

 

There is also Divvy with some cool additional capabilities

http://mizage.com/divvy/

 

What about bettersnaptool? Only £1.50 on the App Store

 

Window Tidy

http://itunes.apple.com/us/app/window-tidy/id456609775?mt=12

 

I second bettersnaptool. For $1.99 it is a steal compared to most of the other suggestions, and it is VERY intuitive. All are good, but bettersnaptool definitely has the most bang for the buck.

 

BetterTouchTool already has more than you'll likely need and is exactly $0.00.

 

Yeah Better touch tool has more functionality than all the others above and is free.