UFRaw VS RawTherapee

Why not just use https://www.rawtherapee.com/ or https://www.darktable.org/ to process raw files? You can still export from these as .xcf or tiff for further work in gimp if you like. Otherwise ufraw can be used as a plugin http://ufraw.sourceforge.net/ Https://digital-photography-school.com/opening-raw-images-in-gimp-with-ufraw-for-windows-the-basics/ (you mention "are only on linux" but don't mention your OS. Source: over 2 years ago

I haven't used either of these personally but darktable and Raw Therapee are two open-source options that seem to get recommended a lot. Source: 10 months ago

Some closing links to edit images, just because I dislike Adobe as a company :P. Https://krita.org/en/ - a great and free image editing tool, focused on painting but very much funtional in many ways you would also find in Photoshop. Https://www.photopea.com/ - an online alternative of Photoshop. Https://www.darktable.org/ - A free lightroom alternative to edit raw photos with. Http://rawtherapee.com/ - Dito for... Source: 11 months ago

Is GIMP not an option? Raw Therapee? Darktable? Source: 12 months ago

Darktable and RawTherapee for editing raw photos. Source: about 1 year ago

I use digikam to organise my photos and rawtherapee to edit. Both free and open source, more than enough capability for non-pro use. Source: about 1 year ago