darktable is a very powerful free, open-source Raw image editor. However it only runs on Linux.

darktable guides on this blog

Installation on Ubuntu

Shadows and highlights module

Clarity

How to get a vintage look

Links

Official blog

Guide to darktable installation on Ubuntu

User manual and wiki

Flickr group

Frequent darktable discussions at pixl.us

A pdf book: Digital photo development with darktable

Tutorials:

Youtube tutorials:

 


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