  We describe the AMReX suite of astrophysics codes and their application to
modeling problems in stellar astrophysics. Maestro is tuned to efficiently
model subsonic convective flows while Castro models the highly compressible
flows associated with stellar explosions. Both are built on the
block-structured adaptive mesh refinement library AMReX. Together, these codes
enable a thorough investigation of stellar phenomena, including Type Ia
supernovae and X-ray bursts. We describe these science applications and the
approach we are taking to make these codes performant on current and future
many-core and GPU-based architectures.
