Color Palette Generator - Enter the URL of an image and find its color palette
Who Can Use - WhoCanUse is a tool that brings attention and understanding to how color contrast can affect different people with visual impairments.
Site Palette - Get the essential colours from any website
Cron Color - Free web tool for designing color palettes and checking contrasts.
Material Palette - Generate and export your Material Design color palette
Palette For Mac - A menu bar based colour contrast analyser