Site Palette - Get the essential colours from any website
Who Can Use - WhoCanUse is a tool that brings attention and understanding to how color contrast can affect different people with visual impairments.
Color Palette Generator - Enter the URL of an image and find its color palette
Cron Color - Free web tool for designing color palettes and checking contrasts.
Koa11y - Automatically detect accessibility (a11y) issues on webpages
Material Palette - Generate and export your Material Design color palette