It is a Python emulator of Intel 4004 cpu - created for solving these programming puzzles.
It could be run from command line like this:
$ python main.py examples/test.asm
Documentation in form of wiki is currently in state of being created. You can already read about most essential instructions there and see examples in our online emulator.
Online version is based on the same files but gives you an opportunity to try it without downloading and running in the console.