Applications developed on Adobe AIR are like combination of web application and desktop software. It can be used as standalone application and can be collaborated online. Adobe AIR is not platform in-depended it can be run on Windows, Linux, MAC, Android, BlackBerry Tablet OS, and iOS mobile operating systems.
There are thousands of Adobe AIR based apps available for free. These apps are available for most of the use from music, game, graphic to business apps. You will not be short for apps you can find apps of your interest.
There is a latest release of Adobe AIR runtime 2.6 have a look what’s new in Adobe AIR 2.6:
Large maximum window size
Local microphone API
IME API and IME text input
WebKit with HTML5/CSS3 support
iOS 4 support for iPad, iPhone, and iPod touch
USB debugging for Android
Hardware graphics acceleration
Automatic soft keyboard support
To run Adobe AIR based apps you need Adobe AIR runtime-environment you can get it from Adobe AIR website but it is an online installer. If you need an offline installer for Adobe AIR then you can download from link below.