Altstore - A home for apps that push the boundaries on iOS
AppAddict - AppAddict is an online tool that allows you to download third-party apps on your devices without rooting or jailbreaking your devices.
Cydia - An alternative app store for jailbroken devices.
25pp - 25pp is App Store that contains exclusive apps that are not yet available on app stores.
iOS Haven - A listing of tweaked apps and games for iOS devices. Install directly from the browser.
Kuaiyong - Kuaiyong brings features to install free as well as paid apps on Apple devices without jailbreaking them.