What I like to use are the plugins "Scratchpad"¹, for color-mixing and brush-testing, “ShadeMaker” to quickly create graded palettes, and in addition the plugin “Pigment.O” already suggested by @Takiro. I think this combination is suitable to achieve something similar, even if not united in one plugin and with 100% of this functionality, but it should come close.
And probably it’s not the baddest idea to get the “Palette Generator” “on board” as well.
I think it fits well in this combo.
Michelist
¹ Direct >> download <<
Topic about Scratchpad on KA →