"...To do this, Mallavarapu used the programming language LISP, a language widely used in artificial intelligence research. LISP is famous among computer scientists due to its ability to write code that, in turn, can write code, enabling a programmer to derive new mini-languages [...] «This language is stepping into an unknown universe, when your computer starts building things for you,» says Gunawardena. «Your whole relationship with the computer becomes a different one. You've ceded some control to the machine. The machine is drawing inferences on your behalf and constructing things for you.» ..." -- the little b language is free software under the MIT license (I definitely prefer the GPL, but it's another story...)