Hydrodynamics

Einstein toolkit

https://einsteintoolkit.org/index.html

Cacutas

CANS+

https://github.com/chiba-aplab/cansplus

athena++

Athena++ GRMHD code and adaptive mesh refinement (AMR) framework

https://github.com/PrincetonUniversity/athena

CASTRO

https://github.com/AMReX-Astro/Castro

OpenMHD

https://github.com/zenitani/OpenMHD

GR1D

https://github.com/evanoconnor/GR1D