 Hussler compounds are a unique class of materials with many fascinating properties, including half metals, multi-feroics, shape memory alloys, and topological insulators. They also have a wide range of tunable functionalities, making them highly desirable for applications in spintronics, energy technologies, and magnetocaloric applications. Additionally, their tunability makes them ideal candidates for designing novel materials with desired properties. This article was authored by Claudia Felser, Lukas Wolman, Stanislav Chadov, and others.