http://retinaicon.com/
免费图片网站
https://pixabay.com/
http://littlevisuals.co/
https://picjumbo.com/
https://pjrvs.com/a/photos/
http://wefunction.com/category/free-photos/
https://www.pexels.com/
http://xxgblog.com/2015/06/29/nginx-detect-mobile/
http://api.rubyonrails.org/
ruby-doc.org
扁平化ppt制作
图标
代码网站 https://codepen.io
bootsnipp
login
http://bootsnipp.com/snippets/D25A4
materia form
http://bootsnipp.com/snippets/P3KKa
https://github.com/selimdoyranli/material-form
全屏滚动 http://bootsnipp.com/snippets/D25A4
团队产品
http://bootstrap.cn/themes/mbw1013-4/index.html