Awesome APK (Android Package) Feature Extractor 
- APKiD - Android Application Identifier for Packers, Protectors, Obfuscators and Oddities - PEiD for Android
- Apktool - Apktool is a powerful, open-source command-line tool used for reverse engineering Android applications (APK files). It allows users to decode compiled Android resources and Dalvik bytecode (in .dex files) back into their nearly original, human-readable forms, such as XML files for layouts and Smali code (a low-level assembly-like language for the Dalvik Virtual Machine).
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Contributions of any kind welcome, just follow the guidelines!