FlexPMD is a tool that helps to improve code quality by auditing any AS3/Flex source directory and detecting common bad practices, such as:

• Unused code (functions, variables, constants, etc.)
• Inefficient code (misuse of dynamic filters, heavy constructors, etc.)
• Over-complex code (nested loops, too many conditionals, etc.)
• Over-long code (classes, methods, etc.)
• Incorrect use of the Flex component lifecycle (commitProperties, etc.)

A report is produced describing the violations of a given rule set. FlexPMD includes a rule set that is broad ranging and continually growing. It is also straightforward to create new rules and users are encouraged to do so.

FlexPMD can currently be invoked from:

• The command line
• Maven
• Ant
• Automator on Mac OS X
• Eclipse
• TextMate on Mac OS X
• FlashDevelop

http://opensource.adobe.com/wiki/display/flexpmd/FlexPMD