Color Palette Generator - Enter the URL of an image and find its color palette
Material Palette - Generate and export your Material Design color palette
Site Palette - Get the essential colours from any website
Material UI Colors - Color palette for material design
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.
Color Hunt - Curated collection of beautiful colors, updated daily