Darktable and RawTherapee are both popular, open-source RAW photo editors.
Darktable has a more modern interface making it more suitable for amateur enthusiasts who want to make basic edits.
https://www.darktable.org/
RawTherapee is much more attractive to professional photographers who can take advantage of the in-depth system and powerful color correction tools, while working with a clunky interface.
https://www.rawtherapee.com/