The Nanoscale Materials and Device Group has developed an easy-to-use, interactive simulation tool for complex, multi-layer dielectric, MOS and MIM devices. This program is useful for visualizing approximations of energy band diagrams, and performing back-of-the-envelope calculations of their important parameters.
More details can be found here: https://www.boisestate.edu/qdna/multi-dielectric-energy-band-diagram-program/