I created a set of Photoshop, Sketch and Affinity Designer documents that use base colors to generate larger palettes. It’s a bit like an advanced color picker, in the form of a document.
Here’s the Sketch template in action:
More info: https://bjango.com/articles/colorcreator/
Instructions for each supported design tool:
Download: Color Creator Templates
The templates are free and open source (BSD license).
I hope you find the templates useful.