Apps similar to Five-Column Springboard include Springtomize. It's paid, but Six Icon Dock is free. Other options are Iconoclasm and Infiniboard. In total there are four Dock Utilities like Five-Column Springboard for iPhone and iPad.
Springtomize gives you an all-in-one settings page for tweaking the homescreen the homescreen of your jailbroken iPhone. You can disable elements you don't use, or customize the look of the icons, the dock, the folders, the status bar, and the lock screen.
Italy
EU
Iconoclasm is a tweak that lets you break the barriers of what you can do with the app icons of your jailbroken iOS device. You can define as many rows or columns you want. You can even break free from rows and columns, and simply have icons placed freely on your home screen.
Canada
Vertically scroll your home screen pages! Infiniboard lets you add as many icons as you want to each page of your jailbroken iPhone, and access them through a flick up and down.
United States
This tweak allows you to have 6 icons in the dock of your jailbroken iPhone. NOTE: It will not work if you have Five Icon Dock installed (it's ether or).
