Material UI is a CSS framework and set of React components that incorporate Google’s Material Design. Components include buttons, drop downs, menus, switches, toolbars, and more.

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Motherplate: A bare bones responsive boilerplate

Motherplate is a bare bones HTML5, CSS3, and SCSS responsive boilerplate. It doesn’t include any visual styling or components, just bare bones CSS to get started with.

A bare bones responsive SCSS boilerplate for web designers

Flexy Boxes: A flexbox code generator and playground

Flexy Boxes is a flexbox code generator and playground in one. Just set the options for your flexboxes, preview them, and then output the code.

Koutu Swiss: A CSS framework for Stylus

 

Koutu Swiss is a CSS framework for Stylus. It gives you tons of mixins, functions and utilities for faster coding.

Bumpkit: A library for the Web Audio API

Bumpkit is a still-in-progress DAW-inspired library for the Web Audio API. It lets you create mixers, sampler instruments, and more.

Basics

Create a mixer with two tracks

var mixer = bumpkit.createMixer().addTrack().addTrack();

Create a new Sampler instrument and load an audio buffer

var sampler = bumpkit.createSampler().connect(mixer.tracks[0]);

bumpkit.loadBuffer('/audio/clap.mp3', function(buffer) {
  sampler.buffer(buffer);
});

CSS-Flip: A CSS BiDi flipper

Need to generate left-to-right or right-to-left CSS? CSS-flip does that for you, from your source. It supports a variety of properties, including borders, margins, padding, and more.