FlashDevelop is an open source code script designed for ActionScript development. It could be quickly set up and easily to be used as an external editor for the Flash IDE or a complete development environment. It is not a great purpose code editor but also offers advanced ActionScript coding support. It main used for ActionScript 2, ActionScript 3 but can be used for other languages like MXML and HaXe also. If you are intersted in it please visit following URL download the latest copy and get more detail.