if you dig quantum computing, there is an open source simulator you may be interested in checking out.
>OpenQubit has released the first public [stable] release of the OpenQubit
>quantum computing simulation library. This release also features the
>ability to factor numbers via Shor's polynomial time factoring algorithm.
>OpenQubit is a group of physicists, computer scientists, hobbyists, and
>laymen that is attempting to create an Open Source quantum computer
>simulation API. The latest OpenQubit release is available here. The
>OpenQubit homepage is at http://www.openqubit.org. OpenQubit will also be
>featured in an article about quantum computing in an upcoming issue of UK
>magazine PC World.