RawTherapee

 

Tool:	RawTherapee
Description:	RawTherapee is a powerful, cross-platform raw photo processing system, released as Free Software (GPLv3). It is designed for developing raw files from a broad range of digital cameras and targeted at users ranging from enthusiast newcomers who wish to broaden their understanding of how digital imaging works to professional photographers.
Platform:	Linux, MAC, Windows
Download:	http://rawtherapee.com/downloads/
Review:	https://youtu.be/9P-GBsoCvzg
Ease of Use: Scale of 1 to 5; 1 being easiest, 5 being hardest	2
Costs:	Free