Mockjax
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Mock Your Ajax Requests with Mockjax for Rapid Development
The mockjax plugin is a development and testing tool for intercepting and simulating ajax requests made with jQuery with a minimal impact on changes to production code.

This is a sweet piece of Javascript that allows to build frontends on simply configured mock ajax data, speeding up the production pipeline on web projects.
Why You Should Use XMLHttpRequest Asynchronously
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Why You Should Use XMLHttpRequest Asynchronously
8.4% of all hangs in IE9 in the past month are caused by XMLHttpRequest objects blocking the UI thread with a synchronous request.

jQTouch
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jQTouch — jQuery plugin for mobile web development
A jQuery plugin for mobile web development on the iPhone,
Android, Palm Pre, and other forward-thinking devices.

APE (Ajax Push Engine)
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About - APE (Ajax Push Engine) :: Real time data streaming
Ajax Push Engine (APE) is an OpenSource technology allowing to exchange data between thousands of users through a web browser, without reloading and without external plugins.

As a complete packaged solution, it is designed to push real-time data in a lightweight, highly scalable and modular way, only using Javascript for the client side. With the use of those Web Stardards, APE is fully crossbrowser and uses all the latest browser features and provides backward compatibility for older ones.

Erin Walrath
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Erin Walrath

Piano Etudes
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Piano Etudes
Inspired by the tradition of open-form musical scores, I composed each of these four piano etudes as a collection of short musical fragments with links to connect them. In performance, the pianist must use those links to jump from fragment to fragment, creating her own unique version of the composition. The pianist, though, should not have all the fun. So I also developed this web site, where you can create your own version of each etude, download it as an audio file or a printable score, and share it with others. In concert, pianists may make up their own version of each etude, or they may select a version created by a web visitor.
flXHR Project
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flensed :: flXHR Project
flXHR(flex-er) is a *client-based* cross-browser, XHR-compatible tool for cross-domain client-to-server Ajax (Flash) communication. It utilizes an invisible flXHR.swf instance that acts as sort of a client-side proxy for requests, combined with a Javascript object/module wrapper that exposes an identical interface to the native XMLHttpRequest (XHR) browser object, with a few helpful additions and a couple of minor limitations

YQL
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Ajaxian » YQL - converting the web to JSON with mock SQL
YQL is a SQL-style language to get information from all kind of web services, and - using oAuth - even Yahoo's social graph. There is a test console available for you to get to grips with all the information it gives you access to (which is a lot!)

SolrJS
Category:
SolrJS
A JQuery based ajaxian interface to the Solr search engine
CSSHttpRequest
CSSHttpRequest
CSSHttpRequest (CHR) is a method for cross-domain AJAX using CSS for transport.

Similar to JavaScript, this works because CSS is not subject to the same-origin policy that affects XMLHttpRequest. Like JSONP, CSSHttpRequest is limited to making GET requests. Unlike JSONP, untrusted third-party JavaScript cannot execute in the context of the calling page.