 We describe a comprehensive review of magnetic properties of Huesler compounds with an emphasis on their inverse structure. These compounds allow the emergence of novel functionalities such as spin transfer torque and topological insulators. In the context of magnetic engineering, the spin transfer torque of manganese rich Huesler compounds can be exploited to create useful applications such as spintronics, energy technologies and magnetocaloric materials. In the context of photoemission, the spin transfer of manganese rich Huesler compounds can be exploited to create spintronics materials with high spin polarization. The tuning of Huesler materials is a key challenge for the realization of applications such as spintronics, energy technologies and magnetocalorics. This article was authored by Claudia Felser, Lukas Wolman, Stanislav Chadov and others.