The Adobe® AIR® runtime includes both the WebKit HTML and Adobe Flash® engines, enabling applications built using HTML, JavaScript, Flash, or Adobe Flex®. Because Adobe AIR supports these technologies equally, developers can use the tools with which they are already familiar to build web applications in the browser.
Download the software, SDKs, extensions, and frameworks you need to build, package, and deploy Adobe AIR applications in your preferred development environment.
Adobe tools with integrated support for Adobe AIR

Adobe AIR extension for Dreamweaver CS4
Adobe Dreamweaver® CS4 software provides integrated support for delivering web applications on the desktop with Adobe AIR 1.1. The AIR extension to Dreamweaver CS4 enables the use of Adobe AIR 1.5 enhanced capabilities.

Adobe AIR update for Flash CS4 Professional
Adobe Flash CS4 Professional software provides integrated support for delivering interactive experiences on the desktop with Adobe AIR 1.1. The AIR update to Flash CS4 Professional enables the use of Adobe AIR 1.5 enhanced capabilities.

Flex Builder 3
Adobe Flex Builder™ 3 software, an Eclipse™ based IDE, provides integrated support for delivering rich Internet applications outside the browser with Adobe AIR 1.1. Flex Builder 3.2 includes support for Adobe AIR 1.5 enhanced capabilities.
Flex developers should review the technote, How to overlay the AIR SDK for use with the Flex SDK.
SDKs

Flex 3 SDK
If you prefer working with a text editor or another development environment, the free Adobe Flex 3 SDK has all you need to build and deploy applications for Adobe Flash Player software or Adobe AIR using the open source Flex framework.
Flex developers should review the technote, How to overlay the AIR SDK for use with the Flex SDK.

Adobe AIR SDK
If you prefer working with a text editor or another development environment, the free Adobe AIR SDK provides the tools you need to package and deploy Adobe AIR applications built using HTML, JavaScript, or Flash.
Adobe Creative Suite® 3 extensions

Adobe AIR update for Flash CS3 Professional
Package and preview AIR application files from within Flash CS3 Professional.

Adobe AIR extension for Dreamweaver CS3
Package and preview AIR application files from within Dreamweaver CS3.
Third-party tools

Aptana Studio
Aptana Studio is a free, open source, Ajax-focused development environment with support for HTML, CSS, and JavaScript development.