YUI

A legacy, open-source JavaScript and CSS library for building interactive web applications with a focus on modular architecture and cross-browser consistency.

Pts

A lightweight and modular typescript library that comes with many useful algorithms for visualization and creative coding.

Analytics.js

An open-source library that collects customer data and sends it to many different tools using an API from Segment CDP.

Beasties

A plugin that inlines your app's critical CSS and lazy-loads the rest.

Fabric.js

A JavaScript canvas library with serialization and SVG-to-canvas/canvas-to-SVG parsers.

Scriptaculous

An open-source JavaScript library built on the Prototype framework that provides visual effects, user interface controls, and AJAX utilities for web applications.

Zepto

A lightweight and modular open-source JavaScript library with a largely jQuery-compatible API, designed for modern browsers and optimized for fast execution and small file size.

Framer Motion

A simple yet powerful motion library for React.

Flowplayer

A commercial video player and delivery platform for on-demand, live, and simulated live streaming.

SystemJS

A hookable, standards-based, dynamic ES module module loader.

Barba.js

A lightweight library to make websites run like a SPA by creating smooth transitions between pages.

Client-side support for CSS custom properties (aka "CSS variables") in legacy and modern browsers.

SignalR

A library for ASP.NET that enables real-time two-way communication between servers and clients.

Quill

An open-source JavaScript WYSIWYG text editor designed to provide consistent content editing across browsers using a structured document model.

Locomotive Scroll

A simple scroll library with smooth scrolling, parallax effects, toggling classes, and triggering event listeners when elements are in the viewport.

Htmx

An open-source JavaScript library that extends HTML by adding custom attributes to trigger AJAX requests, CSS transitions, WebSockets, and Server-Sent Events directly in HTML markup.

Fingerprint

A commercial browser fingerprinting solution that queries browser attributes and computes a hashed visitor identifier from them.

iScroll

A high-performance JavaScript library for smooth scrolling.

URI.js

A JavaScript library for manipulating URLs.

Socket.io

A library that enables real-time, bidirectional and event-based communication between the browser and the server.

Motion UI

A Sass library for creating flexible CSS transitions and animations.

Mustache.js

A zero-dependency implementation of the mustache template system in JavaScript.

LocalForage

An offline storage library that provides a unified API for IndexedDB, WebSQL, and localStorage.

Ruffle

An Adobe Flash Player emulator written in the Rust programming language.

Pikaday

A lightweight JavaScript datepicker with no dependencies.