Minified.js
Replace jQuery or MooTools with a <4kB Library
Mag.js
MagJS - Modular Application Glue
Bonzo
library agnostic, extensible DOM utility
Masonry
Layout elements in a grid, like a mason fitting stones in a wall
Ac Colors
ac-colors is a reactive JavaScript color library that can freely convert between RGB, HSL, HEX, XYZ, LAB, LCHab, LUV, and LCHuv, as well as handle random color generation and contrast ratio calculation.
Packery
bin-packing layout library
Eqcss
EQCSS is a plugin that introduces Element Queries, Scoped CSS, a Parent selector, and responsive JavaScript to all browsers IE8 and up
Wow
Reveal CSS animation as you scroll down a page
Mootools Core
MooTools Core Repository
Bind.js
bind.js - simple two way data binding to HTML and callbacks
Reseter.css
Reseter.css - A Futuristic Alternative To Normalize.css And CSS Resets
Polymer
Leverage the future of the web platform today.
Bespoke.js
DIY Presentation Micro-Framework
Handorgel
Accessible W3C conform accordion written in ES6.
Cortex
A javascript library for centrally managing data with React
Hapi
The Simple, Secure Framework Developers Trust
Xui
A tiny javascript framework for mobile web apps.