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

一个帮助大家选色、调色，提供色彩搭配参考，调色轮网站。

Beautiful Color Palettes

提供渐变色和配色方案，还能从提供的图片中提取主要配色

WebGradients is a free collection of 180 linear gradients that you can use as content backdrops in any part of your website.

Curated gradients for designers and developers