High Image Quality

Get the most details and least artifacts from your raw photos thanks to modern and traditional demosaicing algorithms: AMaZE, DCB, fast, AHD, EAHD, HPHD & VNG4.
Advanced color handling from white balance to HSV (Hue-Saturation-Value) curves and color management.
Enhanced exposure and tonality tools: tone and Lab curves, highlights and shadows tools, etc.
Multiple denoising methods: luminance, chrominance, impulse (for salt and pepper noise) noise reduction.
Several tools to enhance details: unsharp mask, RL deconvolution, contrast by detail levels.

Efficiency

Multi-threaded algorithms for high performance (RawTherapee can utilize modern processor features).
Quick thumbnails load lightning fast and are replaced later with live thumbnails
Batch processing: convert all the developed images at once without not loading the processor while you work.
Basic tools immediately at your hands.
Parallel editing of multiple images.
An optional secondary display can be used.

Versatility

Wide variety of supported cameras: almost all DSLRs and even some medium format bodies are supported.
Advanced control over the algorithms with many fine-tuning parameters.
Command line usage besides the normal graphical interface.
Various layouts: multiple tabs, single tab with filmstrip, vertical tab with filmstrip.

Freedom for Free

RawTherapee is free and open source software, meaning you can use it free of charge, wherever you like on whatever hardware you like, as long as you abide by the copyleft GPLv3 license. Download the source code, modify it, feel free to do what comes to mind. We believe in open software.
RT is cross-platform: Linux, Mac, or Windows, be it 32-bit or 64-bit - you pick, we provide.
International: it is available in 25 languages!