JavaScript-based tool to draw diagrams using ASCII characters.

D3.js is a JavaScript library for manipulating documents based on data. D3 helps you bring data to life using HTML, SVG and CSS. D3’s emphasis on web standards gives you the full capabilities of modern browsers without tying yourself to a proprietary framework, combining powerful visualization components and a data-driven approach to DOM manipulation.

Yet another emulator for the 6502 microprocessor. The site also has an interesting toy unix written in JavaScript.

Interesting way to authenticate and encrypt HTTP without using SSL. Note the security concerns in some of the comments.

Ymacs is an Emacs-like editor that works in your browser. Currently (starting with tag v0.4 in the code repository) it works in recent versions of Firefox (and other Gecko-based browsers), Google Chrome and Apple Safari.

TinyMCE is a platform independent web based JavaScript HTML WYSIWYG editor control released as Open Source under LGPL by Moxiecode Systems AB. It has the ability to convert HTML TEXTAREA fields or other HTML elements to editor instances.

Web calculator implemented in JavaScript. Implements arbitrary precision, plotting, prime testing, polynomial roots, matrix arithmetic and very limited (polynomials) symbolic integration. Written by Fabrice Bellard, who also wrote TinyCC, QEmacs, FFMPEG, QEMU and more.

Javascript code to bind keys to functions in browsers such as Firefox, Chrome.

So, Arc came out about a week ago, and I tried to stay away, but it was just too tempting. I ended up spending a week porting it to JavaScript.