I first learned this trick for generating hues for colors when you don't know how many you'll need. I think LibreOffice might do this. It always picks blue and

I first learned this trick for generating hues for colors when you don't know how many you'll need. I think LibreOffice might do this. It always picks blue and orange for the first 2 series in a chart. But you can keep picking and it always has more colors that are just slightly different than all the previous ones.