The emergence of millimeter-wave technology exploiting unused frequency bands starting from 30 GHz opens new vistas for a plurality of application fields. TRITON will provide and co-integrate highly efficient gallium-nitride-on-silicon-carbide (GaN-on-SiC) and silicon-germanium (SiGe) electronics with silicon-on-insulator (SOI) photonics through a silicon interposer serving as versatile integration bench.