Flotr2
Graphs and Charts for Canvas in JavaScript.
Code Mirror
In-browser code editor
Device.js
Device.js makes it easy to write conditional CSS and/or JavaScript based on device operating system (iOS, Android, Blackberry, Windows, Firefox OS), orientation (Portrait vs. Landscape), and type (Tablet vs. Mobile).
Spa Eye
Backbone debugger for Firefox
Timeline JS
TimelineJS: A Storytelling Timeline built in JavaScript.
Selectivity
Modular and light-weight selection library for jQuery and Zepto.js
Qooxdoo
A Universal JavaScript Framework
Csso
CSS-optimizer
Respond
A fast & lightweight polyfill for min/max-width CSS3 Media Queries (for IE 6-8, and more)
Clmtrackr
Javascript library for precise tracking of facial features via Constrained Local Models
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).
Outdated Browser
A simple tool to identify and upgrade old browsers.
Layr
Dramatically simplify full‑stack development
Gulp
The streaming build system
Dygraphs
Interactive visualizations of time series using JavaScript and the HTML canvas tag. The dygraphs JavaScript library produces interactive, zoomable charts of time series.
Cube.js
📊 Serverless Analytics Framework
Blitz
⚡️The Fullstack React Framework — built on Next.js