Contra
Asynchronous flow control with a functional taste to it
Alasql
AlaSQL.js - JavaScript SQL database for browser and Node.js. Handles both traditional relational tables and nested JSON data (NoSQL). Export, store, and import data from localStorage, IndexedDB, or Excel.
Animo.js
A powerful little tool for managing CSS animations
Drawingboard.js
A canvas based drawing app that you can integrate easily on your website.
Swig
Take a swig of the best template engine for JavaScript.
No Ui Slider
noUiSlider is a lightweight JavaScript range slider library. It offers a wide selection of options and settings, and is compatible with a ton of (touch) devices, including those running iOS, Android, Windows 8 and Windows Phone 8.
Anijs
Declarative handling library for CSS animations.
Jscritic
Quickly check how well 3rd party script behaves.
Flow Js
Javascript Library for Multi-step Asynchronous Logic
Upfile
Makes file inputs a pleasure to use with progressive enhancement.
Highway
A fast, lightweight and simple Javascript routing library with no dependencies.
Wee
Blueprint for modern web development
Tus Jquery Client
A jquery plugin implementing the tus resumable upload protocol.
Tmlib.js
JavaScript をより使いやすく, より便利に, そしてより豊かに.
Sticky Navbar.js
stickyNavbar.js: Fancy sticky navigation jQuery plugin with smart anchor link highlighting
Punycode.js
A robust Punycode converter that fully complies to RFC 3492 and RFC 5891, and works on nearly all JavaScript platforms.
Playground
Playground.js is a framework for your javascript based games. It gives you out-of-box access to essentials like mouse, keyboard, sound and well designed architecture that you can expand to your needs.