This is a simple, vanilla, JavaScript Turing Machine simulator. It allows you to define a Turing machine program, provide an input tape, and run the simulation to see the output. It can be seen, in sandbox mode, here. No account is required for sandbox mode, and nothing is saved on our servers in this mode, the intent for sandbox mode would be that everything is saved on your local browser storage, however that is not currently implemented.
Machines that are saved on the server, for sharing, however are stored in a mongo instance.