AppAgg - Application Aggregator
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
AppAdvice - AppAdvice is the leading online and 'onapp' resource covering all thing iOS
Fnd - Browse Apple App Store and iTunes on the Web
Apple Sliced - Apple Sliced searches the Web for the lowest prices and uses only Authorized Apple Resellers, so...
Cydia - An alternative app store for jailbroken devices.