WebGradients is a free collection of 180 linear gradients that you can use as content backdrops in any part of your website.
RGB颜色值与十六进制颜色码转换工具，能将RGB颜色值与十六进制颜色码相互转换
Beautiful Color Palettes
The daily color digest
Curated gradients for designers and developers
Beautiful colored gradients
Khroma is the fastest way to discover, search, and save color combos you'll want to use.
