CSSGradient.io - As a free css gradient generator tool, this website lets you create a colorful gradient background for your website, blog, or social media profile.
Color Palette Generator - Enter the URL of an image and find its color palette
Material UI Colors - Color palette for material design
Klart.io Colors - A data-driven collection of beautiful color palettes 🌈
Materialette - A material design color palette on macOS / Windows / Linux
Grabient - Grab a gradient