1 The tool library commonly used when looking for application icons:
https://www.iconfont.cn/home/index?spm=a313x.7781069.1998910419.2
iconfont library, you can choose the image download format and change the image color
2 RGB color comparison table:
https://tool.oschina.net/commons?type=3
3 github：
https://github.com/