androguard
Reverse engineering tool for Android applications. Written in Python.
TLDR
Display Android app manifest
$ androguard axml [path/to/app.apk]
Display app metadata (version and app ID)
$ androguard apkid [path/to/app.apk]
Decompile Java code from an app
$ androguard decompile [path/to/app.apk] --output [path/to/directory]