Winterboard - Give your iPhone or iPod Touch a graphical overhaul!
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
Lockinfo - You can find this app in Cydia - Tweaks.
Cydia - An alternative app store for jailbroken devices.
Springtomize - Tear down the walls
Fnd - Browse Apple App Store and iTunes on the Web