APKiD - Android Application Identifier for Packers, Protectors, Obfuscators and Oddities

APKiD gives you information about how an APK was made. It identifies many compilers, packers, obfuscators, and other weird stuff. It's PEiD for Android. For more information on what this tool can be used for, check out: Android Compiler Fingerprinting Detecting Pirated and Malicious Android Apps...