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

Beautiful Color Palettes

Trianglify Generator

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.

免费在线LOGO设计和配色网站