s.a. http://forum.xda-developers.com/showthread.php?t=2011811
It is a tool for reengineering 3rd party, closed, binary Android apps. It can decode resources to nearly original form and rebuild them after making some modifications; it makes possible to debug smali code step by step.
Bitmask is an open source application to provide easy and secure encrypted communication. You can choose among several different service providers or start your own. Currently, Bitmask supports encrypted internet (VPN) with encrypted email coming soon
GNU/Linux Distris als chroot auf Android
Introducing screengrab: automating screenshots on Android