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A tool for reverse engineering 3rd party, closed, binary Android apps. It can decode resources to nearly original form and rebuild them after making some modifications. It also makes working with an app easier because of the project like file structure and automation of some repetitive tasks like building apk, etc.

It is NOT intended for piracy and other non-legal uses. It could be used for localizing, adding some features or support for custom platforms, analyzing applications and much more. Although ApkTool can be surely utilized in some unorthodox ways, its development team does not support any illegal activity that may include this particular piece of software. It is intended for various debugging and, implicitly, bug fixing or even feature addition purposes. The required level of know-how does not recommend it to novice users, as well.

Features

Disassembling resources to nearly original form (including resources.arsc, classes.dex, 9.png. and XMLs)
Rebuilding decoded resources back to binary APK/JAR
Organizing and handling APKs that depend on framework resources
Smali Debugging (Removed in 2.1.0 in favor of IdeaSmali)
Helping with repetitive tasks