FlashHunter is a neat Eclipse plug-in I wrote that allows you to kill all running Flash player instances with a single click. Two days ago I was implementing the fast Fourier transformation in Flash and I had a stupid error that caused an endless loop. Since I am testing with the standalone player the only way to get rid of it was Ctrl+Alt+Del and killing it. This is not really a nice workflow so I wrote the plug-in.
I am not a Java developer and definitly not an Eclpise platform developer so the plugin itself is very basic. I experimented a little bit with JNI and wrote most of the plugin in C++ because it still is my language of choice.
The plugin is Windows only. I think you could also do something like that as an external tool for OS X (“killall Flash\ Player”).