I would advise you to look for LUTs or 3DLUT. There is a module for that. Very easy to use and some LUTs give excellent results.
https://www.on1.com/free/luts/ https://rawpedia.rawtherapee.com/Film_Simulation#RawTherapee_Film_Simulation_Collection
https://fixthephoto.com/free-luts http://blog.sowerby.me/fuji-film-simulation-profiles/ https://speckyboy.com/free-lightroom-luts/
These are links that I have in my notebook. I hope they are still working.
I’m à qdirstat guy : https://github.com/shundhammer/qdirstat
From AUR yes. I did not test the flatpak. It needs some time to know how to use it but it is rewarding.
You can have a look at this superb list for you to test other softwares : https://www.linuxlinks.com/best-free-open-source-music-players/
Tauon is really, really great. But because it is not the most stable on my system (arch) I mainly use Strawberry which is also great.
It is heavily inspired by foobar2000, one of the GOAT under windows IMHO.
They are after the tonemapper