Comment (by Michele Grasso):

Hi, I am Michele, a PhD student at the Center for Theoretical Physics in Warsaw and ET user. I believe that having the FLRWSolver thorn included in the ET would be extremely useful for all the users interested in cosmology. The thorn has already a place among the main codes for general-relativistic simulations of cosmological structure formation (see arXiv:2003.08014). I've used the FLRWSolver in my research on relativistic light propagation and observables extrapolation, see arXiv:2107.06306, and I plan to use the thorn in my future works.

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Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2549/inlcude-flrwsolver-in-et