Haxe is an awesome language that compiles to Javascript, Flash, C++, PHP, Neko, Java and C#.
It thus allows to write applications that target native iOS, Android as well as traditional browsers (HTML5 or SWF), servers and desktops (Mac, PC or Linux).

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• Check it out here !
• If you're more into Javascript, check HaxeJS.org
• try-haxe's source code is available on github. Of course, it's written in Haxe ;)