SheetJS
SheetJS Tools for Excel Spreadsheets
AG Grid: High-Performance React Grid, Angular Grid, JavaScript Grid
AG Grid is a feature-rich Data Grid for all major JavaScript frameworks, offering filtering, grouping, pivoting, and more. Free and open-source. Upgrade to Enterprise for advanced features.
three.js – JavaScript 3D library
billyo / Pesky-Adblock
Blocks access to your site until you enable an ad blocker. Turn on that pesky adblock!
Jurassic Systems
Quintus JavaScript HTML5 Game Engine
Microjs: Fantastic Micro-Frameworks and Micro-Libraries for Fun and Profit!
vis.js
LiveScript - a language which compiles to JavaScript
LiveScript is a language which compiles to JavaScript. It has a straightforward mapping to JavaScript and allows you to write expressive code devoid of repetitive boilerplate. While LiveScript adds many features to assist in functional style programming, it also has many improvements for object oriented and imperative programming.
Random color generator for JavaScript - randomColor.js
Regulex : JavaScript Regular Expression Visualizer.
CodeMirror
Ace - The High Performance Code Editor for the Web