AppAddict

AppAddict is an online tool that allows you to download third-party apps on your devices without rooting or jailbreaking your devices.

AppTrackr

Find more and search less with the TrackR app.

Kuaiyong brings features to install free as well as paid apps on Apple devices without jailbreaking them.

iNoJB, formerly iNoCydia, is an amazing Cydia alternative requiring no jailbreak!

iNuclearApp is an iOS emulator which runs tweaks, etc.