RawTherapee is described as 'free RAW converter and digital photo processing software. All changes can be applied and batch processed at a convenient time' and is a very popular raw photo processor in the photos & graphics category. There are more than 25 alternatives to RawTherapee for a variety of platforms, including Windows, Mac, Linux, iPhone and iPad. The best alternative is digiKam, which is both free and Open Source. Other great apps like RawTherapee are darktable, Adobe Lightroom, Shotwell and Polarr.
digiKam is an advanced digital photo management application which makes importing and organizing digital photos a "snap". The photos are organized in albums which can be sorted chronologically, by folder layout or by custom collections.
darktable is a virtual lighttable and darkroom for photographers: it manages your digital negatives in a database and lets you view them through a zoomable lighttable. it also enables you to develop raw images and enhance them.
Almost everyone thinks darktable is a great alternative to RawTherapee.
From high-precision light and color tools, to advanced clarity and dehaze settings, to the ability to create and save your own filters. Polarr is the ideal photo editor for bloggers, students, and photo professionals alike.
Fotor is a online picture editor and graphic designer, allowing you to use online photo editing tools, such as add filters, frames, text, stickers and effects…and apply design tools to make creative photo designs and graphics.
Capture One is a leading raw converter and workflow software which enables photographers to reduce the time and effort required to deliver astounding ready-to-use images with excellent color and detail.