The Adobe® AIR™ runtime includes both the WebKit and Adobe Flash® engines, enabling applications built using HTML, JavaScript, Flash, or Flex.
Because Adobe AIR supports all of these technologies equally, developers can use the tools they are already familiar with for building web applications or rich Internet applications (RIAs) 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.
Software

Adobe AIR extension for Dreamweaver CS4
Dreamweaver CS4 provides integrated support for delivering web applications on the desktop with Adobe AIR

Adobe AIR update for Flash CS4 Professional
Flash CS4 Professional provides integrated support for delivering interactive experiences on the desktop with Adobe AIR.

Adobe AIR SDK
The Adobe AIR SDK provides the tools you need to package and deploy Adobe AIR applications, if you prefer working with a text editor or another development environment.

Flex 3 SDK
The Free Adobe Flex® 3 SDK has all you need to build and deploy browser- or desktop-based applications that can run on Adobe Flash Player or Adobe AIR (includes the tools from the Adobe AIR SDK).

Adobe AIR extension for Dreamweaver CS3
Package and preview Adobe AIR application files from within Adobe Dreamweaver® CS3 software.

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

Flex Builder 3
Develop RIAs with Adobe Flex Builder™ 3 software, an Eclipse™ based IDE (includes the Flex 3 SDK and the tools from the Adobe AIR SDK).