RawTherapee has an HSV tool. HSV stands for 'Hue-Saturation-Value' where Value means luminance or brightness. Other image processing applications call the same type of tool 'HSL (Hue-Saturation-Luminance)' or 'HSB (Hue-Saturation-Brightness)'.
These tools are divided into eight or so color bands: red, orange, yellow, green, aqua, blue, purple, and magenta or similar. They allow one to shift the hue, increase or decrease saturation, and increase or decrease luminance for each color range independently of the other color bands. Rather than shifting all colors by the same amount using color temperature and white balance controls, you can emphasize and/or de-emphasize certain colors without shifting all of the colors. I've always thought of it as kind of a "graphic equalizer" (to borrow a term used in audio processing) for color.
This answer to What is the effect where some objects are a single bright color but the rest is black and white? shows several extreme examples of using an HSV/HSL/HSB tool to reduce saturation to monochrome for all but one or two colors.
This answer to How to edit photos shot in fluorescent light has some detailed examples of how an HSL tool was used to adjust for the color casts to a wide variety of skin tones shot under less-than-full-spectrum lighting.
This answer to Lots of noise in my hockey pictures. What am I doing wrong? shows how an HSL tool was used to remove color casts from different types of less-than-full-spectrum lighting in different areas of the same scene.
These questions show other "looks" or corrections for less-than-ideal lighting that can be achieved using an HSV/HSL/HSB tool:
How are these washed-out, but bright, colors achieved?
How do I get this foggy/cold/blueish look in my photos?
How to deal with shots at night with different kinds of light from different sources?
How can I remove the blueish color tone from some pixels?
How is this sort-of duotone achieved?