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
一个帮助大家选色、调色，提供色彩搭配参考，调色轮网站。
Beautiful colored gradients
Best Flat Colors For UI Design
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
Khroma is the fastest way to discover, search, and save color combos you'll want to use.
