Mithril.js
A Javascript Framework for Building Brilliant Applications
Uikit
A lightweight and modular front-end framework for developing fast and powerful web interfaces.
Tinymce
TinyMCE is a JavaScript library for platform independent 'WYSIWYG' or rich text editing. It is released as open source under the LGPL.
Ol3
OpenLayers 3
Semantic Ui
Semantic empowers designers and developers by creating a shared vocabulary for UI.
Medium Editor
Medium.com WYSIWYG editor clone.
Mjml
MJML: the only framework that makes responsive-email easy
React Intl
Internationalize React apps. This library provides React components and an API to format dates, numbers, and strings, including pluralization and handling translations.
Jquery UI
The official jQuery user interface library.
Mustache.js
Minimal templating with {{mustaches}} in JavaScript
jQuery Validation
jQuery Validation Plugin
Hammer.js
A javascript library for multi-touch gestures // You can touch this
Photo Swipe
PhotoSwipe is a HTML/CSS/JavaScript based image gallery specifically targeting mobile touch devices
Bootswatch
Themes for Bootstrap
Hyperapp
1 kB JavaScript framework for building web applications.
Prism
Lightweight, robust, elegant syntax highlighting. A spin-off project from Dabblet.