Color Schemes

Color Schemes – Color guidelines for Material Design
Adobe Color CC – Color wheel for color harmony inspiration
Brand Colors – Collection of official brand color codes
Color Safe – Accessible color palettes based on Web Content Accessibility Guidelines (WCAG)
WebAIM Color Contrast Checker – Test how your selected colors work with web usability
Flat UI Colors – Common flat colors for UI
Color Hunt – Color Hunt for inspirations
Degraeve – Color Palette Generator
Color Drop – Color palettes curated by a designer
Brand Colors – Official colors of the world’s biggest brands
Klart – A data-driven collection of color palettes