Platform.js
A platform detection library that works on nearly all JavaScript platforms.
Boiler
Boiler is a utility library that makes every day tasks in JavaScript easier by providing over 115 methods that work on arrays, collections, functions, numbers, objects, and strings.
Datacamp Light
Convert any blog or website to an interactive learning platform for data science
Hydra.js
Create a scalable, maintainable and module oriented system using Hydra.js
Koa
Expressive middleware for node.js using ES2017 async functions
Gijgo
Gijgo - Free Javascript Controls
Visibility.js
Visibility.js allows you to determine whether your web page is visible to a user, is hidden in background tab or is prerendering. It allows you to use the page visibility state in JavaScript logic and improve browser performance by disabling unnecessary timers and AJAX requests, or improve user interface experience (for example, by stopping video playback or slideshow when user switches to another browser tab).
Tangle
a JavaScript library for reactive documents
Director
a tiny and isomorphic URL router for JavaScript
Theory
Abstraction layer for cross platform JavaScript.
JSON Editor Online
A web-based tool to view, edit and format JSON
Timeago.js
timeago.js is a tiny library used to format date with `*** time ago` statement. eg: '3 hours ago'.
Underscore
JavaScript's utility _ belt
Functional Js
A functional js library that facilitates currying and point-free / tacit programming
Qooxdoo
A Universal JavaScript Framework
Next.js
Next.js is a lightweight framework for static and server‑rendered applications.