APK Editor Studio - APK Editor Studio is an open-source Android application editor that allows you to edit APKs with the help of reverse engineering.
MultiExtractor - MultiExtractor - Extract picture (JPG, PNG, GIF, BMP, ICO.
JADX - JADX is a decompilation tool that can produce Java Source code from Dex and Apk files, being capable of providing human-readable java classes, it reverses AndroidManifest.
ReFox - ReFox XI, FoxPro code protection, compression and recovery.
APK Studio - APK Studio is an open-source Integrated Development Environment that allows you to recompile and decompile Android applications with its unified interface.
YARA - Yara is a popular tool that finds its use in helping researchers to classify and detect malware.