Plupload is JavaScript API for building file uploaders. It supports multiple file selection, file filtering, chunked upload, client side image downsizing and when necessary can fallback to alternat…

Solr-powered search for Ruby objects

HTML5 Web Socket implementation powered by Flash

simple, intuitive HTTP REPL — Speak HTTP like a local.

Graph collectd metrics in the browser, backed by a JSON API

A jQuery plugin. As you scroll down you see more results coming back at you automatically.

Watch the data fly

A Redis implementation in node.js

jQuery plugin to populate form inputs with example text that disappears on focus. See also http://github.com/mudge/jquery_placeholder

A command-line JavaScript test runner for the Mac

Javascript Rack Adapter

Simple form validation with good UX for MooTools

Crazy Ivan: the really simple continuous integration tool

Republishing Canada's Hansard

Upload progress bars for jQuery.

The ScrewUnit client library (http://github.com/nkallen/screw-unit) plus a convenient ruby server.