In Composer you can apply any Operator to a State. You can do so in order to transform a state or find expectation values. It is also possible to find the spectrum of an operator if you want the eigenstates and eigenfunction, and use them to create linear combinations of states.
Setup time dependencies and watch your system evolve. The Composer supports dynamic potentials, which in combination with the time trace plot can give you real-time insight as your simulation is animating.
Composer is used at Aarhus University for teaching Quantum Mechanics. This tool can help students get a more intuitive introduction to all the new physical concepts, by providing an easy way to visualize and modify quantum systems in real-time.