pegboard is a social bookmarking service that lets you save, search, share and tag your bookmarks with people all over the world!
Little API for sharing. (While it's striving for standardization, right now, it's just like AddThis or ShareThis.)
A mini-book by Addy Osmani
Headless WebKit with JavaScript API. (Use it to generate PDFs, for instance.)
jStat is a statistical library written in JavaScript. It is capable of plotting several probability distributions as well as generating densities, cumulative densities and quantiles.
Write CoffeeScript, compile to javascript.
Real time analytics for Flash and HTML5 casual and social games with powerful leaderboards, level sharing and game distribution.
A reddit community effort to list JS game engines/frameworks.
isolani on the February 2011 Gawker Media redesigns
Felix Geisendörfer on node.js production deployment.
Long stacktraces for V8 implemented in user-land JavaScript.
Thomas Fuchs' bookmarklet that looks at a page's DOM and provides an analysis and suggestions.
A jQuery plugin he provides the ability to target specific letters in...say...a heading with CSS.
A javascript library that hyphenates text so that you can justify it while displaying on the web without creating "rivers"!
webvariant's jQuery integration for hyphenator.js
If you just need to connect to a web socket, use this. If you need to create the server & client, use this (with node.js).
Especially check out: history.pushState() and history.replaceState()
Most of these work in FF & Chrome (if you pretend to be Safari).
A javascript flash runtime so that flash-produced content can run in HTML5 environments.
Felix Geisendoerfer of Debuggable on node.js.
Mozilla developer tutorial on using the canvas element in HTML5.
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