nspluginwrapper. This little program performs a neat trick: It convinces 64-bit Mozilla/Firefox that the browser can handle a 32-bit helper application (such as Flash
# Flash Switcher - (via Zeuslabs) allows you to switch Flash plugin versions on the fly, without reloading Firefox. Supports versions all the way back to Flash 2.
# FlashTracer - With the Flash 9 debug player, you can view your trace information right in
MTASC 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.