http://www.easyicon.net
图标素材,PNG、ICO、ICNS格式图标搜索、图标下载服务,
https://fontawesome.com/icons
http://www.iconfont.cn
http://www.iconarchive.com
https://www.iconfinder.com
https://www.flaticon.com/
「Favicon.io」是一个协助站...
https://fontawesome.com/icons