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

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

一个帮助大家选色、调色，提供色彩搭配参考，调色轮网站。

Create color schemes with the color wheel or browse thousands of color combinations from the Color community.

Best Flat Colors For UI Design

Beautiful Color Palettes