This program does what you think it does: It simulates a Turing Machine(TM). We made it after reading about Turing machines in CM10020. Maybe it will help someone prepare for their exams, or maybe you will use it to write fun programs like Busy Beavers, halting machines and operating systems.
As requested, the source code is now available. Feel free to do whatever you want with it. If you make any improvements/ports, please mail them to us, and we can host them (tel aatt jklm no).