Site Palette - Get the essential colours from any website
Shade - Super easy color contrast insights and recommendations
Sketch Palettes - Sketch plugin to save and load colors into the color picker
Contrast - A macOS app for quick access to WCAG color contrast ratios
Swatches - A fun and accurate color picker for the real world
Color Contrast Cool - Tool to check color contrast as per in dev WCAG 3 APCA