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GIMP

A free alternative for photoshop, good to edit an image

How to use GIMP (Beginners Guide)
GIMP in less than 10 minutes: Beginners Guide
GIMP: how to make a background transparent
Raw Therapee

A free and good alternative for Lightroom to select, edite and discribe your images

Rawtherapee - basic RAW processing
Basic editing in Rawtherapee