Viewport-Genie Adds the real viewport width and height (in px and em) as an element on the body to help with obtaining values for responsive breakpoints.
Matter.js a 2D rigid body physics engine for the web.
CSS-Colors Share & convert CSS colors. CSS.coloratum is a nifty little tool that helps you:
- Share colors with friends and colleagues (never have to go through describing a shade again, just give them the link!)
- Check out what RGB & HSL values correspond to that color keyword you keep using
- Covert HSL to RGB, because you’re done with your prototype and now it has to work in IE8 too
- …and much more!