coolors.co

1.Color picker: I can make shades , tints, hues, temperature, harmony, blindness simulator, contrast checker and color library

2.Extract color pallette from photo

3.crete ccollage

4.contrast checker

5.Generate color/Explore color pallette

6.Trendng colors

canva.com

1.Color wheel

2.Color meaning

cssfontstack.com

1.Lighten and darken a color

colorable.jxnblk.com

1.Contrast checker

picular.co

1.Primary color generator

pigment.shapefactory.co

1.Primary and accent color maker

Some other websites which may be helpful

1. labs.tinyeye.com

Google chrome extension

1.colorpick eyedropper: This extension will help you pick a color from any website on your browser screen.