Five Icon Dock is described as 'Tweaks the dock of your jailbroken iPhone so that it can fit five icons instead of four' and is an app in the OS & Utilities category. There are four alternatives to Five Icon Dock for iPhone and iPad. The best alternative is Springtomize. It's not free, so if you're looking for a free alternative, you could try Six Icon Dock. Other great apps like Five Icon Dock are Iconoclasm (Paid) and Infinidock (Paid).
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.
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.
Infinidock is the ultimate dock customization tool for jailbroken iOS devices. You can add an unlimited number of icons, or however many you want to each page, and the dock will grow to accommodate them.
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). This app is available in the Cydia app store (jailbroken iOS devices only).