The Microgrid Design Toolkit (MDT) is a decision support software created by Sandia National Laboratories to assist in the early stages of microgrid design, allowing users to explore various design options based on objectives such as cost and performance. The latest version, MDT 1.1 beta, has been adopted by organizations including the U.S. Marine Corps for assessing microgrid power systems and has been utilized in various military and municipal applications. The toolkit's innovative features include topology optimization and the ability to analyze reliability and cost-performance trade-offs, making it a significant advancement for microgrid designers.