This is a moxie-rtems port of NetHack running on a modified version of the gdb moxie simulator compiled to javascript with emscripten.
Krister Lagerström is responsible for this marvellous hack.
Also, I suppose this blog entry represents a distribution of some GPL'd source code from GDB, so I need to tell you about the:
And then there's RTEMS:
And finally NetHack: