FlashDevelop

FlashDevelop is a .NET open source script editor designed mostly for Actionscript 2 development. FlashDevelop is very quick to setup and easy to use as an external editor for the Flash IDE or as a complete open source development environment.

    Main Features

  • Project management with seamless SWFMILL and MTASC integration (using a portable standalone command line tool)
  • Advanced Actionscript completion & exploration with automatic classpath detection (even without project)
  • MTASC code checking with clickable error results
  • Integrated SWF player and socket logger

-> http://www.flashdevelop.org