Color Palette Generator - Enter the URL of an image and find its color palette
Site Palette - Get the essential colours from any website
Klart.io Colors - A data-driven collection of beautiful color palettes 🌈
Materialette - A material design color palette on macOS / Windows / Linux
Colour Contrast Analyser - TPGi's ADA Color Contrast Checker checks for helps determine the accessibility the contrast ratio of two colors for WCAG AA and AAA.
Coolors.co - The super fast color schemes generator! Create, save and share perfect palettes in seconds!