Klovis-keyboardmanager-flex4-sample is a project mainly written in ActionScript, it's free.
Adobe
Klovis KeyboardManager AIR (using flex 4) Sample App. It's a simple AIR application that get keyboard combination input and display it. Read my blog at http://flexmorbid.wordpress.com/2011/02/20/using-klovis-keyboardmanager-in-flex-4/