Free Flash Decompiler

Supporting ActionScript 2 and ActionScript 3

During a recent test I have stumbled upon this wonderful tool: HP SWF Scan. It is positioned as a vulnerability scanner for Flash, but what it also does is decompiling. Here is a screenshot:

HP SWF Scan Screenshot

Compared to Flare it supports ActionScript 3, has a usable GUI and generally seems to be more powerful. On the downside, it only runs on Windows.