Cydia

package manager for jailbroken iOS

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Cydia is a graphical user interface of APT for iOS. It enables a user to find and install software unauthorized by Apple on jailbroken iPhones, iPads and iPod touch devices. It also refers to the digital distribution platform for software on iOS accessed through Cydia software. Most of the software packages available through Cydia are free of charge, although some require purchasing.

from Wikipedia