Coolest

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

是一家在线色轮提取网站，使用兼容很强，提供RGB、CMYK、LAB、SHB、HEX五种色彩模式，可以根据自己的要求进行色彩搭配，是配色的必备神器.

Trianglify Generator

uiGradients - Beautiful colored gradients，是以渐变色为主的分享网站，上百种渐变配色方案，可以根据自己的风格搭配，节约了试色时间。

Color Claim was created in 2012 by Tobias van Schneider with the goal to collect & combine unique colors for my future projects.

2017 Grabient by unfold