About MTASC:
MTASC (Motion-Twin ActionScript 2 Compiler) is the first ActionScript 2 Open Source free compiler. It can compile large number of .as class files in a very short time and generate directly the corresponding SWF bytecode without relying on Macromedia Flash or other tools.
About haXe:
haXe is a high-level object-oriented programming language mainly focused on helping programers develop Websites and Web applications. haXe has been designed to be easily portable across several platforms. The haXe compiler supports the following platforms: JavaScript, Flash, Neko.