Best Flash

SWF Intruder
Analyse Flash application security. Can provide runtime data. Semi-automated. Available via GPL v2.
(Added: 15 Jun 2008 | Hits: 463)

SWF Protect
Encrypt and protect your Adobe flash files. Windows only.
(Added: 06 Aug 2006 | Hits: 777)

SWF Utilities: Dcomsoft.com
Includes a Compressor / Decompressor, SWF Debug and protection remover. Windows only.
(Added: 15 Feb 2006 | Hits: 1405)

Zlash
ActionScript decompiler and compiler for Flash .SWF files. Supports upto Flash 7. Windows only.
(Added: 07 Sep 2005 | Hits: 1930)