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

Trianglify Generator

Beautiful colored gradients

Khroma is the fastest way to discover, search, and save color combos you'll want to use.

Best Flat Colors For UI Design

一个帮助大家选色、调色，提供色彩搭配参考，调色轮网站。