codepen.io是一个具有先进功能的在线html可视化编辑器，可以在同样的浏览窗口中单独编辑HTML, CSS,和Java Script。你可以在编写的同时进行预览，还能点击“更改视图”按钮重新进行分层并选中你需要的层，编写完成之后，你可以将代码导出并保存到一个压缩文件中。
Color Claim was created in 2012 by Tobias van Schneider with the goal to collect & combine unique colors for my future projects.
Create color schemes with the color wheel or browse thousands of color combinations from the Color community.
WebGradients is a free collection of 180 linear gradients that you can use as content backdrops in any part of your website.
Flinto is a Mac app used by top designers around the world to create interactive and animated prototypes of their app designs.
Free high-resolution pictures you can use on your personal and commercial projects, free of copyright restrictions.
Access over 900 material system icons, available in a variety of sizes and densities, and as a web font.