Javascript & AJAX

prototype.js is a JavaScript library initially written by Sam Stephenson. This amazingly well thought and well-written piece of standards-compliant code takes a lot of the burden associated with creating rich, highly interactive web pages that characterize the Web 2.0 off your back.

qooxdoo is a universal JavaScript framework with a coherent set of individual components and a powerful toolchain. It is open source under liberal licenses and supported by the qooxdoo community around the world.

JavaScript Lint holds an advantage over competing lints because it is based on the JavaScript engine for the Firefox browser.

This is a step by step description of how to use the PHP IDE and Ajax Tools to create a Rich Internet Application. Following these steps will provide you with a tour of the PHP IDE and Ajax Tools functions.

jQuery is a fast, small, and feature-rich JavaScript library. It makes things like HTML document traversal and manipulation, event handling, animation, and Ajax much simpler with an easy-to-use API that works across a multitude of browsers.

Opal is a Ruby to JavaScript source-to-source compiler.
It comes packed with the Ruby corelib you know and love.
It is both fast as a runtime and small in its footprint.