Cydia Substrate

Cydia Substrate is a software customization platform that, even if it doesn't let you do anything on its own, does support and facilitate the use of other apps. To use this app you need to have your Android device rooted.

It's important to note, if you hold down the lower volume button for a couple seconds, you deactivate Cydia Substrate. This security measure can be very useful and is a good thing to remember if you're going to use the app on a regular basis.

Cydia Substrate is an especially useful app that, although it doesn't do anything by itself, is necessary for using other interesting apps.