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Some lens profile methods provides a way to correct distortion and CA in a single step. When available, applying distortion and CA correction when both enabled in a single pass is more precise (see lensfun ApplySubpixelGeometryDistortion doc) since it's usually how the profile is done. Instead applying the CA correction in a step after distortion correction could lead to a bit different (also if not always visible) correction. This is also required for future lens correction methods (like DNG WarpRectilinear or corrections based on vendor metadata) that provides only merged distortion and CA correction in a single pass.
RawTherapee is a powerful, cross-platform raw photo processing program, released as libre software under the GNU General Public License Version 3. It is written mostly in C++ using a GTK+ front-end. It uses a patched version of dcraw for reading raw files, with an in-house solution which adds the highest quality support for certain camera models unsupported by dcraw and enhances the accuracy of certain raw files already supported by dcraw. It is notable for the advanced control it gives the user over the demosaicing and development process.
Target Audience
RawTherapee is designed for developing raw files from a broad range of digital cameras, as well as HDR DNG files and non-raw image formats (JPEG, TIFF and PNG). The target audience ranges from enthusiast newcomers who wish to broaden their understanding of how digital imaging works to semi-professional photographers. Knowledge in color science is not compulsory, but it is recommended that you are eager to learn and ready to read our documentation (RawPedia) as well as look up basic concepts which lie outside the scope of RawPedia, such as color balance, elsewhere.
Professionals may use RawTherapee as well while enjoying complete freedom, but will probably lack some peripheral features such as Digital Asset Management, printing, uploading, etc. RawTherapee is not aimed at being an inclusive all-in-one program, and the open-source community is sufficiently developed by now to offer all those peripheral features in other specialized software.
Links
Website: https://www.rawtherapee.com/
Forum: https://discuss.pixls.us/c/software/rawtherapee
Features: https://rawpedia.rawtherapee.com/Features
Documentation: https://rawpedia.rawtherapee.com/
Download RawTherapee: https://www.rawtherapee.com/downloads
Download source code tarballs: https://www.rawtherapee.com/shared/source/
Compilation, Branches and Git
Refer to RawPedia for a detailed explanation of how to get the necessary dependencies and how to compile RawTherapee.
Linux: https://rawpedia.rawtherapee.com/Linux