android-security-awesome - A collection of android security related resources. A lot of work is happening in academia and industry on tools to perform dynamic analysis, static analysis and reverse engineering of android apps.
SecMobi Wiki - A collection of mobile security resources which including articles, blogs, books, groups, projects, tools and conferences. *
Themis - High-level multi-platform cryptographic framework for protecting sensitive data: secure messaging with forward secrecy and secure data storage (AES256GCM), suits for building end-to-end encrypted applications.
Quark-Engine - An Obfuscation-Neglect Android Malware Scoring System.
dotPeek - Free-of-charge standalone tool based on ReSharper's bundled decompiler.
hardened_malloc - Hardened allocator designed for modern systems. It has integration into Android's Bionic libc and can be used externally with musl and glibc as a dynamic library for use on other Linux-based platforms. It will gain more portability / integration over time.
AMExtractor - AMExtractor can dump out the physical content of your Android device even without kernel source code.
frida - Dynamic instrumentation toolkit for developers, reverse-engineers, and security researchers.