I think Haxe is underappreciated for areas other than game development. You can write serverside logic with it (compile to js for node.js, php, neko, java, c#, python), and target flash and js in the browser.
I used it extensively at Chumby on apps for the devices since the alternative was using ActionScript 2 (which is basically JavaScript minus the more modern features post-ECMAScript3).
Given roughly the same code (minus the syntax differences for each), the Haxe compiler would run much faster than Adobe's and almost always generated faster bytecode even though I was targeting Adobe's own Flash AVM1. Plus haxe let me use all the goodies the language offers, like non-brain-dead scoping, static typing and the macro system.
http://blog.puzzlingplans.com/post/100992521086/building-a-c...