Based on our record, UFRaw seems to be more popular. It has been mentiond 1 time since March 2021. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
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
Darktable - darktable is an open source photography workflow application and raw developer.
RawTherapee - RawTherapee is a free RAW converter and digital photo processing software.
LightZone - LightZone is a digital photo editor software application.
digiKam - Professional Photo Management with the Power of Open Source
airnef - Wireless download from your Nikon Camera!
Polarr - MacOS, Windows, iOS, Android and online photo editing tools & free photo editors.