The hybrid optomechanical technologies (HOT) consortium will lay the foundation for a new generation of devices, which connect, or indeed contain, several platforms at the nanoscale in a single “hybrid” system. As hybrid interfaces they will allow to harness the unique advantages of each subsystem within a nano-scale footprint, while as integrated hybrid devices they will enable entirely novel functionalities. A particular focus will be on nano-optomechanical devices that comprise electrical, microwave or optical systems with micro- and nano-mechanical systems.