| augment | 4.3.1 | The world's smallest and fastest classical JavaScript inheritance pattern. |
| blueprint | 2.1.5 | A sleek and simple interface for building powerful Javascript classes |
| classie | 1.0.1 | class helper functions |
| domtastic | 0.15.11 | Small, fast, and modular DOM and event library for modern browsers. |
| egjs | 2.0.0 | Set of UI interactions, effects and utilities components library. |
| inheritance-js | 0.4.12 | Simple, lightweight extensions and helpers that make inheritance in JS a breeze, all with pure JavaScript, no extra libraries needed |
| microbejs | 0.5.2 | microbe.js - A modular JS library for DOM manipulation, and more |
| mootools | 1.6.0 | MooTools is a compact, modular, Object-Oriented JavaScript framework designed for the intermediate to advanced JavaScript developer. |
| oojs | 7.0.1 | Power for object oriented JavaScript libraries. |
| primish | 0.3.9 | A portable Class implementation in javascript, forked from MooTools Prime |
| ring.js | 2.2.4 | Ring.js - JavaScript Class System with Multiple Inheritance |
| stampit | 4.3.1 | Create objects from reusable, composable behaviors. |
| react-extras | 3.0.1 | Useful components and utilities for working with React |