The Seismology Working Group promotes and informs the development of open source seismic wave propagation codes in support of seismic source and structure studies, as well as cross-cutting investigations in natural hazards, resource assessments, and planetary geophysics. Seismology codes support both research and learning using a broad range of computing architectures. We aim to anticipate trends in computing and data in order to advance scientific discovery. We welcome feedback from the entire seismological community.