The AGORA collaboration
Analysing Galaxies Of Resolved Anatomy (AGORA) is an international collaboration of theoretical astrophysicists specialising in numerical simulations of galaxy formation. The broad goal of the project is to compare in a systematic and controlled way the different simulation codes used to model galaxies, and discern which of the differences are caused by different numerical schemes vs. different sub-grid physics. Further details about the collaboration and our various science goals can be found here.
I am a member of the collaboration, and am running and analysing simulations using the adaptive-mesh-refinement (AMR) code, The Adaptive Refinement Tree (ART).