Earthquake rupture forecasts (ERFs) are critical seismic hazard research results that provide probabilities of future earthquake times, locations, and magnitudes for a given region. Several generations of ERFs have been developed for California jointly by the USGS and the Statewide California Earthquake Center (SCEC) and are used in broad impact seismic hazard maps. However, advanced physics-based models that account for fault system evolution and are well validated by observations are not yet used. Moreover, current models reside in the hands of a few highly skilled researchers, which reduces research pace and applications for societal benefits.