actionscript

JPEXS Free Flash Decompiler (FFDec) is opensource flash SWF decompiler and editor. Extract resources, convert SWF to FLA, edit ActionScript, replace images, sounds, texts, fonts and more. Various output formats available.

Lightspark is an open source Flash player implementation for playing files in the SWF format. Lightspark can run as a web browser plugin or as a standalone application.