FFDec is a decompiling tool for Flash SWF files. It can view source code of ActionScript 1/2 or 3 parts, export it or edit (p-code editor for AS3). Texts or images can be edited or replaced. It’s also possible to export shapes, images, sounds or movies.
The tool is written in Java, which grants a multiple platforms nature. Some of FFDec features include: exporting scripts, images, shapes, movies, sounds; powerful decompilation method featuring deobfuscation; editing via assembler source (AS1/2 and AS3); clicking decompiled source highlights P-code associated instruction and vice-versa; saving modified actionscript back to the file; replacing images, editing text; displaying SWF resources (shapes, sprites, fonts, buttons…) (Windows only); built-in proxy server for editing SWF files which come through it.