Cydia - An alternative app store for jailbroken devices.
AppRecs - AppRecs sorts through reviews in the App Store and automatically helps you filter out inauthentic results.
Apple App Store - Install apps on your iDevice via the App Store.
Zestia - Zestia is a mobile app designed to assist you in organizing your hectic schedule, social life, and professional persona.
Altstore - A home for apps that push the boundaries on iOS
iOS Haven - A listing of tweaked apps and games for iOS devices. Install directly from the browser.