Question

• 代码运行可视化: 可查看出运行时候的作用域。
• JS Comparison Table: if, ==, ===各种对比情况
• JSDB: The definitive source of the best
  JavaScript libraries, frameworks, and plugins.
• JavascriptOO: every javascript project you should be looking into.
• Favicon Generator: Generate favicons for PC, Android, iOS, Windows 8.
• UI Box: 收集UI相关的代码。
• 喵德利: 源码阅读器

性能优化

• InstantClick: Makes your pages load instantly by pre-loading them on mouse hover.

正则相关

• 可视化正则表达式

CSS

• CSS SELECTORS AND PSEUDO SELECTORS BROWSER COMPATIBILITY
• Browser CSS-Selector-Test

动画

• Hover: css3实现动画效果
• AniCollection: 也是css3实现的按钮动画

ES6

• Babel: Use next generation JavaScript, today.