web design – Is there a program to select a set of 5 to 10 colors according to some main colors?

Suppose I want a "vintage" color scheme and I know that, at least for me, it means a lighter ocean green and a faded orange color.

I know that art students will understand color theory enough to do it from memory, but for the rest of us …

How can I choose colors for a website that will look good together and not hurt or annoy everyone. Is there a program or website that can do this quickly and easily?