What are sites that can visualise and mix colours where are those sites?

I’m not sure what you mean by “visualise and mix colors”, but if you’re looking for a color-mixing tool, I’d suggest checking out sites like Adobe Color CC or Paletton. Both of these sites have tools that allow you to pick colors from a range of palettes, and then mix them together to create your own unique color combinations. It’s like playing with paint on a canvas – you can experiment until you find the perfect shade!