RawTherapee

RawTherapee is where your RAW files go to become photographs. It's a free, open-source RAW developer released under the GPLv3: no subscription, no account, no feature locked behind a tier. You download it, point it at a folder of CR3s, NEFs or ARWs, and start working. It runs on Windows, macOS and Linux, and the project has been actively maintained for well over a decade.

The workflow is non-destructive from the ground up. Every adjustment lives in a small sidecar file next to your image, so the original RAW data is never touched and you can revisit, copy or version your edits whenever you like. Under the hood you get a choice of demosaicing algorithms (AMaZE, DCB, LMMSE and others), proper color management with ICC profiles, and a tool set that goes far beyond sliders: tone mapping, generalized hyperbolic stretch, wavelet levels, capture sharpening, perspective correction, lens corrections through Lensfun, and one of the best noise reduction stacks in free software.

Day to day, you browse folders in the built-in file browser, rate and filter your shots, then edit in a single tabbed window. The interface is dense and the first session can feel like sitting in a cockpit, but everything is exactly where the documentation says it is. Processing profiles let you apply a whole look in one click, snapshots keep your experiments side by side, and the batch queue churns through exports in the background while you keep editing.

Version 5.13, released on July 26, 2026, is a solid step forward. The Gamut Compression and Abstract Profile tools gained finer control, Selective Editing picked up a new Michaelis-Menten tone mapper and capture deconvolution for sharpening, the crop tool can show several guides at once, and HiDPI displays finally get crisp previews and thumbnails. Performance on ARM machines improved, and support landed for a fresh batch of cameras, including the Canon EOS R6 Mark III, Nikon Z5II and Fujifilm X-M5.

Our verdict: if you shoot RAW and want Lightroom-class development without the Lightroom bill, RawTherapee is the obvious starting point. Pair it with a catalog app like digiKam for organizing, since it deliberately skips photo management. Beginners willing to read an afternoon of documentation will be rewarded; everyone else should expect a week of pleasant confusion before it clicks.

Image credits: screenshots by the RawTherapee project (rawtherapee.com). Logo: RawTherapee, public domain, via Wikimedia Commons.