A map viewer / concept design for Android OS and Windows OS. Use your own 1.3 beta levels, temporarily build and destroy blocks, sensor steering, crouch & jump, no-clip mode. Works on low end devices (requires android 2.1 or higher).
The "client" just seems to be a copy of Desmume (a Nintendo DS emulator) that eats up a bunch of system resources and leaves a process constantly running. Not sure if it's actively malicious beyond that, but I'm running an AV scan just to be sure. Oh, and to boot it's not even a .apk